What is Office 365 migration?

Office 365 migration is the process of moving organizational data — mailboxes, public folders, archives, SharePoint, OneDrive, and Teams — into Microsoft 365, out to another platform, or between two tenants. EdbMails Office 365 Migration Software supports all of these scenarios.

How can I migrate to Office 365 using EdbMails?

The whole Office 365 migration process using the EdbMails Office 365 Migration Tool is one of the simplest there is – just connect to your source and target servers and let it do its work. Step 1: Download and install EdbMails. Step 2: Connect to the source using a global administrator account. Step 3: Choose which mailboxes and folders to migrate. Step 4: Connect to the destination server and map the mailboxes. Step 5: Begin the Office 365 migration process.

What are the reasons for migrating to Office 365?

Most teams move to Office 365 for some combination of these: Cost savings: Less spent on on-premise hardware, fewer painful upgrade cycles, and ongoing maintenance becomes someone else's problem. Scalability: Size your environment up or down as the business shifts. Accessibility: Mailboxes, documents, and apps reachable from anywhere, on whatever device the user happens to have. Collaboration: SharePoint, Teams, OneDrive, and Yammer working together for actual teamwork instead of email tag. Security: Built-in threat protection, data loss prevention, and encryption — without needing to bolt on third-party tools. Maintenance: Microsoft handles updates and patches, which frees IT staff for work that actually moves the business. Compliance: Features that help with HIPAA, GDPR, and the rest of the alphabet soup.

What types of Microsoft 365 migration does EdbMails support?

EdbMails covers all the standard Office 365 mailbox migration types. Cutover migration moves every source mailbox into the Office 365 tenant in a single pass — straightforward when the org is small enough to switch over at once. Staged migration breaks the work into phases, useful when you'd rather not move everyone at the same time. Hybrid migration ties on-premise Exchange and Office 365 together for organizations running both. IMAP migration is also on the menu — Gmail to Office 365 being one of the more common examples.

What are the best practices for Office 365 email migration?

The best practices guide for Office 365 mailbox migration covers all the key steps and recommendations to ensure a smooth and successful migration.

What are the migration challenges with Microsoft 365?

There are several common challenges with Office 365 mailbox migration including data integrity, downtime, user access continuity, and large mailbox handling. Detailed breakdown of these challenges is available in EdbMails' migration challenges guide.

Can I use EdbMails to migrate Microsoft 365 to On-Premise Exchange server?

Yes. EdbMails moves Office 365 mailbox data back to on-premise Exchange, with all server versions supported — Exchange 2010, 2013, 2016, and 2019. Step-by-step guidance for migrating from Office 365 to on-premise Exchange is available separately.

What are the steps to migrate Office 365 Public folder with EdbMails?

Public folder migration is straightforward with EdbMails — and there's no PowerShell scripting involved at any point. Step 1: Launch EdbMails and choose Office 365 migration. Step 2: Pick 'Connect to Public folder' as the migration operation. Step 3: Connect to the source Office 365 server and select the public folders. Step 4: Connect to the target Office 365 server and start the migration.

Can I migrate a Microsoft 365 Public folder to Shared mailbox with EdbMails?

Yes - Office 365 public folder to shared mailbox migration is one of the supported scenarios.

How to migrate a large Archive mailbox to Office 365 with EdbMails?

For migrating a large archive mailbox to Office 365: Step 1: Enable In-Place Archive in your Office 365 tenant. Step 2: Download and install EdbMails. Step 3: Connect to the source Office 365 server. Step 4: Pick the large archive mailbox you want to move. Step 5: Connect to the target Office 365 server. Step 6: Start the migration. Every piece of mailbox data — emails, contacts, calendars, tasks, attachments — comes across with full accuracy. No data loss, no corruption, nothing scrambled.

Which license do I need to buy to migrate Office 365 Mailboxes?

You'll need an Office 365 Migration license to move your mailboxes from Office 365.

Can I migrate only new emails using EdbMails without duplicates on the target server?

Yes. By default, the first run is a full migration. From the second run onward, incremental migration kicks in automatically, picking up only new or modified items — no duplicates land on the target. You can also filter by last migration date if you'd rather skip rescanning the whole mailbox each time.

Do I need to pay for Shared mailbox migration?

Yes — each shared mailbox uses up one license, same as a regular mailbox.

Is there a Free Trial version available to test Microsoft 365 migration features?

Yes — there's a Free Trial that opens up every Office 365 migration feature for testing. Up to 30 items per folder from every mailbox come across during the trial.

Is it possible to migrate specific data from source Office 365 to target Office 365?

Definitely. EdbMails handles selective Office 365 migration through filters that you can shape pretty granularly — message received date, sender address, recipients (CC and BCC included), subject line, attachment names, and read/unread status all work as filter criteria.

How do I choose the best Office 365 migration software?

Compare migration tools across capabilities like license type, concurrent mailbox migration, automatic throttling management, incremental migration, public folder licensing, and technical support. Tools that offer lifetime licenses, free upgrades, and 24/7 support typically deliver better long-term value than subscription-based options.

How does the licensing work?

The licensing model is per-mailbox: each migrated mailbox consumes one license, calculated against the source mailbox count. Nothing stops you from running multiple migration jobs in parallel across different machines, as long as you've got licenses left in the pool.

Do you have Office 365 Migration checklists?

Yes - Office 365 migration checklists are available to help you plan and execute your migration successfully.

How many licenses should I purchase for Public folder migration?

Public folder migration takes 20 mailbox licenses. Once those are allocated, you can migrate unlimited public folders from a domain — there's no per-folder cost beyond that.

Does EdbMails support migrating Shared mailboxes to Office 365?

Yes — shared mailbox migration to Office 365 tenants is fully supported. The full set of source items is covered: mailboxes, shared mailboxes, public folders, archive mailboxes, and more. EdbMails handles the shared-mailbox mapping automatically and brings across the contents — emails, attachments, contacts, calendars, tasks, and notes.

Is there any size limitation for Microsoft 365 mailbox migration?

There aren't any size limits on the EdbMails side. Microsoft does enforce its own restrictions, though — those are detailed in the EdbMails Knowledge Base article on Microsoft 365 mailbox size limitations.

Does EdbMails create the mailboxes automatically on the target O365 server?

Yes, EdbMails will automatically create the mailboxes for you on the target and allocate the licenses to be assigned.

Is it possible to map one source folder to the target folder of my choice on the server?

Yes, EdbMails allows customized folder mapping to route source folders to target folders of your choice.

How much time does it usually require to migrate Office 365 mailboxes?

The duration of Office 365 migration depends on a few moving parts. Detailed breakdown of Office 365 migration duration is available in EdbMails' tenant-to-tenant migration guide.

Does the software support all languages during migration?

Yes — EdbMails supports all languages during Office 365 migration.

Can I access the source and target mailbox during migration?

Yes — your mailbox data stays accessible the whole time the migration is running. No server downtime to plan around.

Can EdbMails remove deleted source items from the target Office 365 folders?

Yes — EdbMails can sync deletions from source to target. Tick the 'Remove deleted source items from target folders' option in the main migration window, then run a follow-up migration.

Can I migrate emails from Microsoft 365 to IMAP server using EdbMails?

Yes — Office 365 emails can move to any IMAP-enabled server. The supported list covers most of the popular ones: Outlook, Gmail, Zoho, Zimbra, IceWarp, cPanel, Plesk, GoDaddy, Rackspace, AWS WorkMail, Bluehost, and Dreamhost.

Does EdbMails support Office 365 to Hosted Exchange migration?

Yes — Office 365 to Hosted Exchange is supported. A common example is migrating from Office 365 to a Rackspace-hosted Exchange server.

Will I require a different license for Primary mailbox migration and Archive mailbox migration?

No, you only need one license if both the UPN (User Principal Name) are identical for the Primary and Archive mailboxes.

Does EdbMails manage mailbox mapping from source to target Microsoft 365 server automatically?

Yes, EdbMails automates the mailbox mapping between source and target tenants. For the case when there are hundreds or thousands of mailboxes to be migrated, manual mapping would be a terrible job and EdbMails saves a lot of time.

Does the software generate duplicates when running consecutive Microsoft 365 migrations?

No — incremental migration handles this. Subsequent runs only carry across new and modified items, which keep the target server clean of duplicates.

Does EdbMails handle mailbox mapping between source and target Microsoft 365 servers automatically?

EdbMails automates mailbox mapping between the source and target Tenants, which is useful for large-scale migrations, saving considerable time and effort compared to manual mapping.

Does EdbMails need scripting via PowerShell for Office 365 migration?

No. EdbMails Office 365 migration is an all-graphical-user-interface experience without need of using any PowerShell scripts, or any command-line instruments, or making any API calls. This is regardless of whether it is about migrating mailboxes across tenants, public folders or mailbox archives, hybrid configuration.

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- Google Workspace Migration
- IMAP Migration
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- Windows Data Recovery
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EDB Recovery and Migration

EdbMails lets you recover corrupted, damaged, and offline Exchange EDB files, convert EDB mailboxes to PST format, and directly migrate mailbox data to Office 365 and live Exchange Server.

EDB to PST

Recover corrupted, damaged, offline EDB files and convert Exchange EDB mailboxes to PST file format

Public Folder to Exchange

Migrate public folders from an Exchange offline EDB file to live Exchange Server

EDB to Live Exchange Migration

Directly migrate offline Exchange database (EDB) files to live Exchange server

Archive Mailbox to Office 365

Migrate archive mailboxes from offline EDB files directly to Office 365

EDB to Office 365 Migration

Directly migrate offline Exchange database (EDB) files to Office 365

Public Folder to Office 365

Migrate public folders from an offline Exchange EDB file to Office 365

OST, PST, MBOX, NSF, EML, MSG Export and Migration

EdbMails lets you to recover OST and PST files, export OST, PST, MBOX, NSF, EML, and MSG files to PST files, and directly migrate OST, PST, MBOX, and NSF mailbox data to Office 365 and live Exchange Server.

OST Recovery and Migration

Recover offline OST files, convert OST to PST, and migrate OST to Office 365 and Exchange Server

PST Recovery and Migration

Recover Outlook PST files , Export PST to PST, migrate PST to Office 365 and Exchange Server

MBOX Export and Migration

Export MBOX to PST, migrate MBOX to Office 365 and Exchange Server

NSF Export and Migration

Export NSF to PST, migrate NSF to Office 365 and Exchange Server

EML to PST Export

Convert EML files to Outlook PST files

PST to MSG Export

Convert Outlook PST file to MSG file format

MSG to PST Export

Export MSG files to Outlook PST files

Office 365, Exchange Migration

EdbMails lets you securely migrate mailboxes across Microsoft 365, Exchange, Google Workspace (G Suite), and IMAP-supported servers such as Outlook, Gmail, Zimbra, Zoho Mail, and cPanel, ensuring zero downtime.

Office 365 Migration

Migrate between Office 365 tenants, Office 365 to Exchange, Office 365 to PST, PST files to Office 365.

Exchange Migration

Migrate between any Exchange Servers, Exchange to Office 365, Exchange to PST, PST files to Exchange.

Tenant to Tenant Migration

Migrate Mailboxes, Public Folders, Archive Mailboxes between Office 365 Tenants.

Exchange to Office 365

Migrate Mailboxes, Public Folders, Archive Mailboxes from live Exchange server to Office 365.

Office 365 to IMAP

Migrate Office 365 to IMAP, Office 365 to Gmail, Office 365 to Outlook, Office 365 to Zoho etc.

Exchange to IMAP

Migrate from live Exchange Server to IMAP servers such as Gmail, Outlook, and Zoho Mail.

Public Folder to Office 365

Migrate Public Folders between Office 365 tenants with complete folder hierarchy and mailbox data integrity.

Exchange to PST

Export live Exchange Server mailboxes, public folders, and archive mailboxes to Outlook PST files.

SharePoint, OneDrive & Microsoft Teams Migration

EdbMails lets you migrate SharePoint sites, OneDrive data, Microsoft Teams, teams, channels, chats, permissions, and documents between Microsoft 365 tenants while maintaining the existing folder structure and data integrity.

SharePoint Online Migration

Migrate documents, lists, files and folders from SharePoint sites.

OneDrive for Business Migration

Migrate documents, lists, files, folders, private chats from OneDrive.

Microsoft Teams Migration

Migrate Teams, chats, channels, documents, files and folders etc.

Google Workspace / G Suite Migration

EdbMails Google Workspace Migration Tool migrates emails, calendars, contacts, and more from Google Workspace to Office 365, Exchange, and IMAP using a Google Admin account without requiring individual user credentials.

Google Workspace Migration

Migrate emails, calendars, contacts, tasks from G Suite to Office 365, G Suite to Exchange, G Suite to IMAP Servers

Google Workspace to Office 365

Migrate emails, calendars, contacts, tasks from Google Workspace / G Suite to Office 365

Google Workspace to Exchange Server

Migrate emails, calendars, contacts, tasks from Google Workspace / G Suite to on-Premise Exchange Server

Google Workspace to IMAP

Migrate emails, calendars, contacts, tasks from Google Workspace / G Suite to IMAP, Outlook, Zimbra, Zoho etc.

IMAP Migration

EdbMails IMAP Migration tool lets you easily migrate emails from IMAP servers such as Outlook, Gmail, Zoho Mail, Zimbra, cPanel, and more. Supports IMAP to IMAP, Office 365, Exchange Server, PST, and bulk PST to IMAP migration.

IMAP Email Backup & Migration

Backup and migrate emails from IMAP servers to PST, Office 365, and On-Premises Exchange Server

IMAP to Office 365

Migrate emails, folders, and attachments from IMAP servers to Office 365

IMAP to Exchange

Migrate emails, folders, and attachments from IMAP servers to on-premises Exchange Server

IMAP to PST

Export emails, folders, and attachments from IMAP servers to Outlook PST files for backup

PST to IMAP

Migrate emails, folders, and attachments from bulk PST files to IMAP servers

Duplicate Remover

EdbMails Duplicate Remover lets you easily remove duplicate items from Office 365 and Exchange Server, and from IMAP, Outlook, Gmail, Zimbra, Zoho Mail, etc., ensuring a clean and organized mailbox.

Remove Duplicates

Easily clean up your Office 365, Exchange, Outlook and IMAP accounts by removing duplicate emails.

Remove Duplicates from Office 365

Remove duplicate emails, calendars, contacts, journal tasks, etc. from Office 365.

Remove Duplicates from Exchange Server

Remove duplicate emails, calendars, contacts, journal tasks, etc. from live Exchange Server.

Remove Duplicates from IMAP, Outlook

Remove duplicate emails, attachments from IMAP, Outlook, Gmail, Zimbra, Zoho Mail etc.

Exchange, SharePoint, OneDrive, Teams and Office 365 Backup

EdbMails enables secure, automated backup and recovery for Microsoft 365 services including Exchange Online, SharePoint, OneDrive, Teams, and Live Exchange Server with complete data protection and restore flexibility.

Office 365 Backup

Incremental, Granular, Encrypted and Compressed Office 365 Mailboxes Backup

Exchange Server Backup

Incremental, Granular, Encrypted and Compressed Exchange Mailboxes Backup

SharePoint, OneDrive & Teams Backup

Backup Online site collections, Team sites, Office 365 groups, all documents etc.

Windows Data Recovery

EdbMails Windows Data Recovery Software lets you recover permanently deleted data, including photos, videos, documents, and archived files, from partitions on hard drives, SSDs, USB drives, SD cards, and external storage devices.

Windows Data Recovery

Recover and restore permanently deleted data from hard drives, SSDs, USB drives, SD cards, and etc.

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Office 365 Migration Software

Complete solution for Office 365 Migration

EdbMails Office 365 Migration Software covers every migration direction: tenant-to-tenant, Office 365 to Exchange Server, Office 365 to PST, and PST to Office 365. It migrates mailboxes, public folders, archives, and shared mailboxes automatically, with no PowerShell required and zero duplicates.

Just $299 for 100 Mailboxes

Office 365 to Exchange Migration Office 365 to Office 365 Office 365 to PST Office 365 Public Folder to Office 365 Office 365 Archive Mailbox to Office 365 Office 365 to IMAP PST to Office 365 Office 365 Tenant to Tenant Migration

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Concurrent Mailbox Migration - Now 10X Faster!

All-in-one Office 365 Migration Tool

EdbMails Office 365 Migration Tool handles migration from Microsoft 365, live Exchange, Hosted Exchange, SharePoint, OneDrive, Teams, and IMAP servers — all within a single tool, no switching between platforms. The interface is straightforward enough that non-technical users can run a full migration without outside help or specialized training. Whether you're moving 10 mailboxes or 10,000, the tool scales without compromising speed or data security at any point in the process.

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Enjoy a user-friendly Office 365 migration experience

EdbMails Office 365 Migration tool offers an intuitive, straightforward setup process, making migration tasks easy to manage. With a user-friendly GUI, it features a clean design, consistent layout, and responsive performance across devices. One-click selection covers the entire mailbox, public folder, and archive mailbox data — every item from Inbox, Calendar, Contacts, and the rest migrates accurately, with no duplicates. Clear navigation and immediate feedback guide you through the migration in a handful of clicks. Applying preferential migration settings and filters is built-in and effortless, lifting both efficiency and performance.

Step-by-step wizard instructions and tutorials are on hand at every stage, so the migration runs smoothly even if it’s your first time.

Safeguard your Microsoft 365 data migration with EdbMails

Security sits at the core of every migration. EdbMails is ISO 27001:2013 certified and fully GDPR compliant, with SSL/TLS encryption protecting data in transit, OAuth 2.0 handling authorization, and Multi-Factor Authentication (MFA) layered on top. Modern Authentication is used on every Microsoft 365 endpoint — a more solid approach than the traditional methods. You get the benefits of your new Office 365 environment with stronger security and real peace of mind.

Automate your Microsoft 365 migration

EdbMails Microsoft 365 migration tool provides end-to-end automation in the entire process, from picking the mailboxes and folders from the source server to mapping the mailboxes and folders to the destination tenant to completing the last migration operation. EdbMails automatically creates the target mailboxes and assigns the correct Microsoft 365 licenses. Every source mailbox is mapped to its respective Office 365 destination based on user attributes – there is no human mapping even in situations with thousands of users. Incremental migration is turned on by default on each subsequent run, migrating just those items that are new or changed from the last task. Duplicate items are never written to target. The result is a significant decrease in administrative overhead and predictable migration results for every scale of project, from departmental migrations to major enterprise rollouts.

Automatic throttling management, zero downtime

EdbMails Office 365 migration software automatically manages throttling errors, maintaining consistent transfer rates even during peak server hours and achieving zero downtime. The usual culprits are handled out of the box — "The server cannot service this request right now" and "Active Directory is unavailable," along with related issues. Automatic retry mechanisms cover temporary throttling and connection hiccups, so jobs resume without manual intervention. Concurrent mailbox migration squeezes out more performance while staying within Microsoft’s throttling limits. By prioritizing reliability and following Microsoft’s Office 365 migration best practices, EdbMails keeps the migration moving in the background while end users keep working as usual.

Automatic Office 365 Throttling Management

Microsoft 365 migration tool with flexible options

Flexible migration options

EdbMails Office 365 migration software brings real flexibility to Microsoft 365 projects. The Tenant-to-Tenant migration option transfers data directly between two Office 365 tenants — well-suited to mergers, acquisitions, and departmental reorganizations. The Office 365 to Exchange migration feature handles transitions back to on-premise Exchange, keeping email infrastructure continuity intact when an organization needs to host mail on its own servers. For consolidating group mailboxes, the Group mailbox migration feature moves group mailboxes to a new tenant or within your existing Office 365 environment. The PST-to-Office 365 feature performs a direct migration of bulk PST files to Office 365, streamlining mailbox access when older PST archives need to land in Exchange Online. The Office 365 to IMAP migration feature transfers email from Microsoft 365 to any IMAP server — handy when teams move providers — and the Office 365 to PST export feature saves mailbox data to PST files for offline access, archiving, or legal use cases.

Extensive support for all migration types

EdbMails supports all types of Office 365 migration, which means that you can choose the Office 365 migration methodology best suited to your business’s size and speed. Small and medium sized companies are better off opting for a cutover migration where all your mailboxes are moved to Microsoft 365 simultaneously. With cutover migration, you minimize downtime and get your entire organization on cloud swiftly. Large businesses and those that don't want to rush the migration can use staged migration. The staged migration involves moving mailboxes to Office 365 in stages, thus, enabling you to plan the process strategically. The hybrid migrations that involve coexistence between an on-premises Exchange server and Microsoft 365 are supported.

Support for all Office 365 Migration Types

High performance Office 365 migration software

Enhanced Office 365 migration performance

Microsoft caps standard EWS migration throughput into Exchange Online at roughly 0.2 to 0.5 GB per hour on a single connection — fine for a handful of mailboxes, but slow for anything larger. EdbMails Office 365 Migration Tool works around this ceiling by running multiple mailbox migrations in parallel — up to 20 at once — which multiplies effective throughput while staying inside the per-connection limits Microsoft enforces. The number of concurrent migrations you can run depends on the migration machine's logical processors, available RAM, and upload bandwidth. More processors mean more threads moving in parallel, but once bandwidth is saturated, adding connections stops helping. The setting is exposed in the application so you can tune it to your environment. Pause and resume are built in, so jobs can be stopped and picked up later without losing progress. On any subsequent run against the same target, EdbMails performs a delta scan — moving only new and changed items, skipping anything already migrated. This keeps re-migration runs short and bandwidth use low, regardless of how big the first pass was.

Advanced Microsoft 365 migration software settings

EdbMails migrates everything by default, all mailboxes, all folder types, and all items. When you need finer control, the application provides filter settings that let you narrow down what gets moved without touching anything else. Date filters let you choose to migrate items received after a specific date, items older than a certain date, or everything within a defined date range. Folder filters let you include or exclude specific folder types entirely. Junk Email and Deleted Items are excluded by default — most organizations have no reason to carry that across. Standard folders such as Inbox, Calendar, Contacts, Tasks, and Notes can each be toggled independently, and custom folders can be excluded individually. Additional settings let you adjust the maximum number of concurrent mailbox migrations and the maximum item size per transfer.

Cost-effective Office 365 migration tool

EdbMails makes Office 365 migration genuinely cost-effective — priced up to 50% lower than most competitors. Unlike other tools that charge based on your total number of users, you only pay for the mailboxes you actually migrate. And if you need to migrate the same mailbox more than once, one license covers you every time, which is a real plus when you're running delta migrations during a staged cutover. Any licenses you don't use won't go to waste either — they stay valid indefinitely and work across any client or domain whenever you need them next.

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24/7 Free Technical Support

EdbMails provides 24/7 free technical support. Thus, you are never left stuck at any stage of the migration. Our migration specialists are on hand to help you with the setup, or with resolving any unforeseen issues, or to jump on a remote session to get down to the bottom of the issues, with detailed hands-on. We can be reached at any given time through the live chat or the available numbers. Alternatively, if you want to work on the issues yourself, we have a well-elaborated knowledge base and detailed step-by-step guides to help you.

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Office 365 Migration Steps

Plan and prepare migration

Plan your migration by assessing infrastructure compatibility and choosing the right method. Define the data scope to move, archive, or delete for a successful Office 365 migration.

Migration prerequisites

Ensure network and bandwidth requirements are met, configure both source and target environments, create mailboxes, and assign licenses. Set up public folders and archive mailboxes.

Perform Office 365 migration

Steps to carry out the Office 365 migration with EdbMails, starting from connecting to source and destination server, load mailboxes, map it and migrating it.

Post Office 365 migration activities

After completing the Microsoft 365 migration using EdbMails, verify reports, update MX records and Autodiscover, create new Outlook profiles, and ensure all users are operational.

Office 365 Migration Guide

Key features of EdbMails Office 365 migration software

Incremental (Delta) migration

EdbMails uses an incremental migration approach, only the new items or altered items would be migrated in subsequent runs. Thus reducing network and server utilization and avoiding duplicates. It guarantees that the data transferred is accurate. The delta migration can be used multiple times to keep the destination server synchronized. It also has sophisticated error handling that retries only the failed items.

Concurrent migration of multiple mailboxes

EdbMails uses advanced concurrent mailbox migration to transfer multiple Office 365 mailboxes at the same time. As a result, the migration windows will be drastically reduced. With its multithreading mechanism, EdbMails performs and scales reliably from small jobs to huge enterprise migrations with constant throughput for all mailboxes.

Automatic Microsoft 365 mailbox creation

EdbMails Office 365 migration tool automates target mailbox creation and license assignment, so manual configuration is off the table. Each mailbox is set up on the target with the right user attributes — permissions, mailbox settings, and security configurations all included — using the source user’s data. That removes the risk of configuration errors and ensures every mailbox is fully prepared to receive data. This saves real time and speeds up the whole process in large migrations.

Auto mapping of Microsoft 365 mailboxes

EdbMails automatically maps source mailboxes to target mailboxes during office 365 migration based on important attributes; display name, first name, last name, and the e-mail address. All your users get their corresponding mailboxes migrated automatically. EdbMails can map from one to few thousands of mailboxes. No manual effort is needed. It identifies and maps all relevant mailboxes based on the listed attributes, reducing the setup time and increasing the efficiency to a great level.

Customized target folder selection

EdbMails Office 365 migration software lets you list and map target mailbox folders without much fuss. Map source folders to differently named target folders — ‘Old Emails’ to ‘Archived Mails’, for example — or handle different languages cleanly, like ‘Boîte de réception’ (French for Inbox) to ‘Inbox’. CSV-based mailbox and folder mapping is also supported, so you can pre-define mappings for bulk operations — particularly useful for customized and multilingual folder structures.

Migrate Office 365 emails, calendars, contacts

EdbMails Office 365 migration software handles every item type — emails, contacts, calendars, tasks, notes, and journals — to your target Office 365 server. The software performs a 1:1 migration, keeping the original mailbox structure intact with no data loss. Every email, calendar event, contact, task, and note transfers exactly as it appears in the source mailbox, with all attributes and metadata preserved. That keeps your Microsoft 365 environment organized end to end, with nothing left behind — from regular emails to critical calendar appointments and essential contacts.

Unlimited Public folder migration

EdbMails lets you migrate unlimited public folders from a domain — no PowerShell scripting needed. Emails, contacts, calendars, tasks, and other items transfer cleanly while the original folder structure (subfolders and mail-enabled folders included) is preserved. All public folder permissions migrate accurately to the target Microsoft 365. Complex public folder setups with nested permissions are handled correctly, so permissions and content arrive intact on the target.

Universal language compatibility

EdbMails supports multilingual Office 365 migration across source and target servers running different system languages. Whether your mailboxes contain standard characters or language-specific symbols, the migration process remains accurate and reliable from start to finish. Mailboxes and folders of any language migrate without any changes to the content structure or formatting, and all symbols and characters arrive at the destination exactly as they appear in the source mailbox.

Continuous service availability with zero downtime

EdbMails maintains continuous service availability with zero downtime during the entire Office 365 migration process, and keeps your business continue functioning. Your business will continue receiving the e-mails and working as they did without even interrupting while migration running in the background. It does not matter you are migrating entire data or some individual mailboxes, the e-mail services won't be suspended. Your users will be able to direct switch on new Microsoft 365 tenant with continuation after the migration finished.

Detailed Office 365 migration report

EdbMails automatically generates a detailed Office 365 migration report covering the entire migration. The report shows the number of mailboxes and folders selected, mailbox mapping details, and item counts per folder. That gives you what you need to track progress and verify completeness, ensuring everything has actually transferred to the new Microsoft 365 environment. Errors are highlighted with enough context to act on them when they happen. This helps keep the data accurate and find problems before the final cutover.

Microsoft 365 migration common scenarios

Migrate between Microsoft 365 tenants

EdbMails performs Office 365 Tenant-to-Tenant migration directly, without any loss of mailbox data, calendar data, contacts, tasks, or public folders, from one Microsoft 365 organization to another. Folder structure, item attributes, and various mailbox types, such as shared mailbox and archive mailbox, migrate successfully. This approach is generally applicable for a company merger, a company acquisition, or a department reorganization.

Migrate On-Premises Exchange to Office 365

Migrate Office 365 to an on-premises Exchange server

Organizations that need to move mailboxes from Microsoft 365 back to on-premises Exchange — whether for compliance, infrastructure consolidation, or a reversal of a previous migration — can do so directly with EdbMails. The Office 365 to Exchange Server migration supports all Exchange versions from 2010 through 2019, migrating mailboxes, public folders, archive mailboxes, and shared mailboxes with folder structure and permissions intact on arrival.

Migrate Small Business Server 2011

If you're still on Small Business Server 2011, you've probably noticed the strain — the hardware's aging, scaling anything is a headache, and the security gap keeps widening with each passing year. Office 365 sidesteps all of that. You get a cloud platform with proper security, room to grow, and collaboration tools your team will actually use. EdbMails moves mailboxes, public folders, and archive mailboxes from SBS 2011 to Office 365 directly — no intermediate hops, no hybrid setup, just a clean cutover to the cloud.

Hosted Exchange to Microsoft 365 migration

Migrate from hosted Exchange server

Hosted Exchange providers like Rackspace, GoDaddy, and Intermedia spare you the trouble of running your own mail server, which is great until you actually need to do something administrative. The restricted access is what pushes most teams toward Microsoft 365 — more control, more features, fewer support tickets just to make a basic change. EdbMails takes care of the move itself: mailboxes, calendars, contacts, and everything else from Hosted Exchange to Office 365, encrypted in transit and handled end to end.

Public folder to Shared mailbox migration

Public folder to Shared mailbox migration is one of those changes that pays off twice. The licensing math alone makes a strong case — shared mailboxes under 50 GB don't need a license, so the savings show up immediately on the next renewal. Beyond the cost angle, you also lose the public folder management overhead (anyone who's wrestled with permission inheritance there knows what I mean), and resources end up centralized in a way teams actually find usable.

Restore bulk PST files to Microsoft 365

Restoring bulk PST files to Office 365 is not an easy task, but EdbMails simplifies it completely from start to end. It migrates multiple files simultaneously. So you won't wait for one PST file to get over before moving on to the next, this will definitely saves huge time when transferring bulk data. It successfully handles large PST file smoothly without any issue and secure all throughout, so your IT team will have full confidence.

What data gets migrated from Microsoft 365?

Mailbox migration:

Every email, contact, calendar, task, note, and journal entry, with the original folder structure preserved exactly as it was.

Public folder migration:

Subfolders, mail-enabled folders, items, and permissions — all of it carries over.

Archive mailbox migration:

In-Place Archives migrate alongside the primary mailbox, or as their own job if you'd rather split them.

Shared mailbox migration:

Full item migration with source-to-target auto-mapping handled for you.

Group mailbox migration:

Microsoft 365 group mailboxes, moved either within a tenant or between tenants.

Resource mailbox migration:

Room and equipment mailboxes, with booking configurations intact on the other side.

Swift and Secure Office 365 Migration

Swift and secure Microsoft 365 Migration

Two things people usually have to trade off in a migration project — speed and security. EdbMails Office 365 Migration Tool doesn't ask you to pick. Multi-threaded processing keeps the transfer rate up, the migration runs in the background with zero downtime, and your team carries on with their day uninterrupted.

On the security side: the metadata used for incremental delta comparison is encrypted with AES-256 and never leaves the machine you ran the migration on. The migration itself flows through Microsoft's own APIs, following the path Microsoft recommends. Your credentials? Never touch EdbMails servers — when it's time to sign in, you're handed off to Microsoft 365's actual sign-in page, where OAuth 2.0 and TLS handle authentication.

Know more

Office 365 Migration: Frequently Asked Questions

What is Office 365 migration?
Office 365 migration is the process of moving mailbox data, public folders, and archive mailboxes out of Microsoft 365 to another Microsoft 365 tenant, on-premises Exchange Server, PST files, or an IMAP server. EdbMails Office 365 Migration Software supports all of these scenarios.
How can I migrate to Office 365 using EdbMails?
The whole Office 365 migration process using the EdbMails Office 365 Migration Tool is one of the simplest there is – just connect to your source and target servers and let it do its work.
Step 1: Download and install EdbMails.
Step 2: Connect to the source using a global administrator account.
Step 3: Choose which mailboxes and folders to migrate.
Step 4: Connect to the destination server and map the mailboxes.
Step 5: Begin the Office 365 migration process.
Click here for the detailed Office 365 to Office 365 Migration Guide
What are the reasons for migrating to Office 365?
Most teams move to Office 365 for some combination of these:
Cost savings: Less spent on on-premise hardware, fewer painful upgrade cycles, and ongoing maintenance becomes someone else's problem.
Scalability: Size your environment up or down as the business shifts
Accessibility: Mailboxes, documents, and apps reachable from anywhere, on whatever device the user happens to have.
Collaboration: SharePoint, Teams, OneDrive, and Yammer working together for actual teamwork instead of email tag.
Security: Built-in threat protection, data loss prevention, and encryption — without needing to bolt on third-party tools.
Maintenance: Microsoft handles updates and patches, which frees IT staff for work that actually moves the business.
Compliance: Features that help with HIPAA, GDPR, and the rest of the alphabet soup.
What types of Microsoft 365 migration does EdbMails support?
EdbMails supports all the standard Office 365 migration types — cutover, staged, hybrid, and IMAP — covering small single-pass switchovers, phased moves for larger orgs, on-premises/cloud coexistence, and email-only sources like Gmail. Each method has different requirements and size limits, so for a full comparison of how they work and which one fits your environment, see our guide to the types of Office 365 migration.
What are the best practices for Office 365 email migration?
The best practices guide for Office 365 mailbox migration is here.
What are the migration challenges with Microsoft 365?
See Office 365 Migration Challenges.
Can I use EdbMails to migrate Microsoft 365 to On-Premise Exchange server?
Yes. EdbMails moves Office 365 mailbox data back to on-premise Exchange, with all server versions supported — Exchange 2010, 2013, 2016, and 2019. Step-by-step guidance for migrating from Office 365 to on-premise Exchange is available separately.
What are the steps to migrate Office 365 Public folder with EdbMails?
Public folder migration is straightforward with EdbMails — and there's no PowerShell scripting involved at any point.
Step 1: Launch EdbMails and choose Office 365 migration.
Step 2: Pick 'Connect to Public folder' as the migration operation.
Step 3: Connect to the source Office 365 server and select the public folders.
Step 4: Connect to the target Office 365 server and start the migration.
The full procedure is documented under Public folder migration to Office 365.
Can I migrate a Microsoft 365 Public folder to Shared mailbox with EdbMails?
Yes - Office 365 public folder to shared mailbox migration is one of the supported scenarios.
How to migrate a large Archive mailbox to Office 365 with EdbMails?
For migrating a large archive mailbox to Office 365:
Step 1: Enable In-Place Archive in your Office 365 tenant.
Step 2: Download and install EdbMails.
Step 3: Connect to the source Office 365 server.
Step 4: Pick the large archive mailbox you want to move.
Step 5: Connect to the target Office 365 server.
Step 6: Start the migration.
Every piece of mailbox data — emails, contacts, calendars, tasks, attachments — comes across with full accuracy. No data loss, no corruption, nothing scrambled.
Which license do I need to buy to migrate Office 365 Mailboxes?
You'll need an Office 365 Migration license to move your mailboxes from Office 365.
Can I migrate only new emails using EdbMails without duplicates on the target server?
Yes. By default, the first run is a full migration. From the second run onward, incremental migration kicks in automatically, picking up only new or modified items — no duplicates land on the target. You can also filter by last migration date if you'd rather skip rescanning the whole mailbox each time.
Do I need to pay for Shared mailbox migration?
Yes — each shared mailbox uses up one license, same as a regular mailbox.
Is there a Free Trial version available to test Microsoft 365 migration features?
Yes — there's a Free Trial that opens up every Office 365 migration feature for testing. Up to 30 items per folder from every mailbox come across during the trial. Click here to grab it.
Is it possible to migrate specific data from source Office 365 to target Office 365?
Definitely. EdbMails handles selective Office 365 migration through filters that you can shape pretty granularly — message received date, sender address, recipients (CC and BCC included), subject line, attachment names, and read/unread status all work as filter criteria. Click here for the filter setup.
How do I choose the best Office 365 migration software?
Compare migration tools across capabilities like license type, concurrent mailbox migration, automatic throttling management, incremental migration, public folder licensing, and technical support. Tools that offer lifetime licenses, free upgrades, and 24/7 support typically deliver better long-term value than subscription-based options. For a detailed evaluation framework and feature comparison, see our guide on the best Office 365 migration software.
Does EdbMails manage mailbox mapping from source to target Microsoft 365 server automatically?
Yes, EdbMails automates the mailbox mapping between source and target tenants. For the case when there are hundred or thousands of mailboxes to be migrated, manual mapping would be a terrible job and EdbMails saves a lot of time.
Why do most Office 365 migration projects fail?
Office 365 migration projects rarely fail because of tooling. The failure patterns that come up consistently across projects are:
1. Incomplete pre-migration assessment: Skipping the infrastructure audit means SMTP relay dependencies, legacy add-ins, and distribution group attributes only surface after cutover — when fixing them is expensive.
2. Mismatched migration type: Running a cutover migration against an environment with 800 mailboxes, or a staged migration against Exchange 2013, creates problems that no tooling can fully compensate for.
3. Poor coordination between IT and business units: Cutover windows that land during quarter-end close, board meetings, or regulated reporting cycles create outage incidents that overshadow a technically clean migration.
4. Inadequate end-user communication: Users who receive no notice before cutover generate a support backlog in the first 48 hours that can take weeks to clear.
EdbMails eliminates the tooling risk — automatic mailbox mapping, incremental migration, throttling management, and zero duplicates are built in.

How does EdbMails secure data during Office 365 migration?
Security is built into every stage of an EdbMails migration rather than being a separate configuration step.
1. Authentication: EdbMails uses Microsoft Graph APIs with OAuth 2.0 (MSAL) for all Office 365 connections. Sign-in goes through Microsoft's own authentication page — credentials are never stored on EdbMails servers.
2. Encryption in transit: All data transferred between source and target uses TLS 1.2. There are no unencrypted migration paths.
3. Encryption at rest: Local metadata used for incremental delta comparison is encrypted with AES-256 and never leaves the machine running the migration.
4. MFA and Conditional Access: EdbMails works natively with Multi-Factor Authentication and Conditional Access policies already configured in your tenant. No policy exceptions or workarounds are needed.
5. Compliance certifications: EdbMails is ISO/IEC 27001:2013 certified and GDPR compliant. These controls apply to the migration tool itself, not just the data it moves.
For the full list of security controls to validate in your Microsoft 365 tenant before cutover, see the Office 365 migration challenges and solutions guide.
How does the licensing work?
The licensing model is per-mailbox: each migrated mailbox consumes one license, calculated against the source mailbox count. Nothing stops you from running multiple migration jobs in parallel across different machines, as long as you've got licenses left in the pool. Click here to check your purchased licenses and how many mailboxes you've already migrated.
Do you have Office 365 Migration checklists?
Yes - Click here for the Office 365 migration checklists.
How many licenses should I purchase for Public folder migration?
Public folder migration takes 20 mailbox licenses. Once those are allocated, you can migrate unlimited public folders from a domain — there's no per-folder cost beyond that.
Does EdbMails support migrating Shared mailboxes to Office 365?
Yes — shared mailbox migration to Office 365 tenants is fully supported. The full set of source items is covered: mailboxes, shared mailboxes, public folders, archive mailboxes, and more. EdbMails handles the shared-mailbox mapping automatically and brings across the contents — emails, attachments, contacts, calendars, tasks, and notes.
Is there any size limitation for Microsoft 365 mailbox migration?
There aren't any size limits on the EdbMails side. Microsoft does enforce its own restrictions, though — those are detailed in this Knowledge Base article.
Does EdbMails create the mailboxes automatically on the target O365 server?
Yes, EdbMails will automatically create the mailboxes for you on the target and allocate the licenses to be assigned.
Is it possible to map one source folder to the target folder of my choice on the server?
Yes, EdbMails allows customized folder mapping to route source folders to target folders of your choice.
How much time does it usually require to migrate Office 365 mailboxes?
Click here for the breakdown of Office 365 migration duration — it depends on a few moving parts.
Does the software support all languages during migration?
Yes — EdbMails supports all languages during Office 365 migration.
Can I access the source and target mailbox during migration?
Yes — your mailbox data stays accessible the whole time the migration is running. No server downtime to plan around.
Can EdbMails remove deleted source items from the target Office 365 folders?
Yes — EdbMails can sync deletions from source to target. Tick the 'Remove deleted source items from target folders' option in the main migration window, then run a follow-up migration. There's more on the additional mailbox migration options for Office 365 if you want to dig in.
Can I migrate emails from Microsoft 365 to IMAP server using EdbMails?
Yes — Office 365 emails can move to any IMAP-enabled server. The supported list covers most of the popular ones: Outlook, Gmail, Zoho, Zimbra, IceWarp, cPanel, Plesk, GoDaddy, Rackspace, AWS WorkMail, Bluehost, and Dreamhost. Click here for the full procedure.
Does EdbMails support Office 365 to Hosted Exchange migration?
Yes — Office 365 to Hosted Exchange is supported. A common example is migrating from Office 365 to a Rackspace-hosted Exchange server. The GoDaddy to Office 365 and Rackspace to Office 365 guides are also worth a look if those are part of your scenario.
Will I require a different license for Primary mailbox migration and Archive mailbox migration?
No, you only need one license if both the UPN (User Principal Name) are identical for the Primary and Archive mailboxes.
Does the software generate duplicates when running consecutive Microsoft 365 migrations?
No — incremental migration handles this. Subsequent runs only carry across new and modified items, which keep the target server clean of duplicates.
Does EdbMails handle mailbox mapping between source and target Microsoft 365 servers automatically?
EdbMails automates mailbox mapping between the source and target Tenants, which is useful for large-scale migrations, saving considerable time and effort compared to manual mapping.
Does EdbMails need scripting via PowerShell for Office 365 migration?
No. EdbMails Office 365 migration is an all-graphical-user-interface experience without need of using any PowerShell scripts, or any command-line instruments, or making any API calls. This is regardless of whether it is about migrating mailboxes across tenants, public folders or mailbox archives, hybrid configuration.