EdbMails EDB Recovery and Migration software
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    Exchange EDB / Email Recovery Tools
    • EDB Recovery and MigrationRecover EDB to PST, EDB to Office 365 and Exchange NO Duplicate Migration
    • OST Recovery and MigrationRecover OST to PST, OST to Office 365 and Exchange Migration
    • PST Recovery and MigrationRecover Outlook PST, PST to Office 365 and Exchange Migration
    • MBOX Export and MigrationExport MBOX to PST, MBOX to Office 365 and Exchange Migration
    • NSF Export and MigrationExport NSF to PST, NSF to Office 365 and Exchange Migration
    Exchange and Office 365 Migration
    • Exchange Server MigrationMigrate Exchange 2007, 2010, 2013, 2016, 2019 to Office 365 tenants. Also, migrate between Exchange servers and PST
    • Office 365 MigrationMigrate Source Office 365 tenants to Destination Office 365 tenants. Also, migrate to Exchange Server and PST
    • IMAP Email Backup & MigrationMigrate all IMAP email servers (Gmail, Zimbra, Zoho, Yahoo etc.), Office 365, Exchange and Backup to Outlook PST
    • SharePoint Online MigrationMigrate documents, files and folders from SharePoint sites
    • OneDrive for Business MigrationMigrate documents, files and folders from OneDrive
    • Microsoft Teams MigrationMigrate Teams, documents, files and folders etc.
    Exchange and Office 365 Backup
    • Office 365 BackupIncremental, Granular, Encrypted and Compressed Office 365 Mailboxes Backup
    • Exchange Server BackupIncremental, Granular, Encrypted and Compressed Exchange Mailboxes Backup
    • SharePoint, OneDrive & Teams BackupBackup Online site collections, Team sites, Office 365 groups, all documents etc.
    • Duplicate Remover - Office 365 & Exchange Remove duplicate emails, calendars, contacts, journal etc. from Office 365 and Exchange
    • GAL and All Address Lists migrationDirectly migrate Exchange and Office 365 Global address list and Address Lists items
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    1. Home
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    3. Step by Step Guide to Migrate OST to Office 365

    Import OST to Office 365

    Steps to import Outlook OST to Office 365

User Manual

  • Overview
  • System Requirements
  • Installation
    • Installation process
    • Reinstall or Upgrade
    • How to uninstall
  • Initial Setup
  • FAQ
    • OST to PST
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • Videos
    • OST to PST Converter
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • Screenshots
    • OST to PST
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • How it works?
    • OST to PST Converter
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • Connect to Exchange server for multiple mailboxes migration
    • Connect with Global Admin
    • Connect to multiple users using CSV file
    • Connect using full access permission
    • Connect individual users for Single / Specific user Migration
  • Connect to Hosted Exchange for its Migration
    • Connect with Full Access permissions
    • Using multiple user credentials with CSV file
    • Connecting to Individual user for its migration
  • Connect to Office 365
    • Modern Authentication Using OAuth 2.0
      • Microsoft 365 modern authentication
      • Automatic Registration
      • Manual Registration
    • Connect with Global Admin
    • Connect to Office 365 with full access permission
    • Connect to Office 365 with CSV file option
    • Connect to Office 365 as single user mailbox
  • Set Exchange Server Impersonation rights
    • Exchange 2007 and below
    • Exchange 2010, 2013, 2016 and 2019
    • Set using Exchange Server GUI
  • Knowledge Base
    • Corrupt OST file recovery
    • Unicode and ANSI OST format
    • Split OST file
    • Rebuild OST file
    • Exchange mailbox backup
    • Recover orphaned OST file
    • Recover all Exchange and Outlook OST files
    • Recover metadata and attachments
    • Export unlimited OST files to PST
    • Free OST file viewer
    • Granular recovery of OST file
    • Recover encrypted OST file
    • Recover deleted mailboxes from OST
    • Export email, calendars, contacts
    • Selective OST export
    • Migrate OST to Office 365
    • OST to Live Exchange
    • Outlook OST cannot be accessed
    • Log report
    • Fix Outlook not connecting to server error
    • Fix Outlook the set of folders cannot be opened
    • Fix Outlook not syncing error
    • Outlook Cached Exchange mode
    • Fix Outlook data file cannot be accessed
    • Fix the error Outlook inbox not updating
    • Your mailbox has been temporarily moved on Exchange server
    • Open OST file in Outlook
    • Repair corrupted OST files from Outlook 365
    • Save Outlook emails to hard drive
    • Import OST file into Outlook
    • Your Outlook data file cannot be configured
    • Errors have been detected in the OST
  • Incremental Migration
  • Exchange Throttling Policy
  • Set Office 365 Impersonation rights
    • Using PowerShell commands
    • Using Office 365 GUI
  • Map the Mailboxes
  • Multifactor Authentication
    • Enable MFA in Office 365
    • Create App password for MFA
    • Disable Security Defaults

EdbMails OST to Office 365 converter tool

EdbMails is a powerful and secure software solution that can help you import mailboxes from Outlook OST to Office 365. With its modern OAuth 2.0 authentication technology, it provides a safe and secure way to transfer all your mailbox data to the Microsoft 365 cloud.

It is a Microsoft-partnered migration software, which makes it an ideal solution for those who are looking for a fast, easy and reliable way to import OST into Office 365. EdbMails also provides a dedicated Office 365 migration tool, which can help you perform tenant-to-tenant migrations and move your email data between Office 365 tenants.

EdbMails OST to Office 365 converter tool

QUICK LINKS

OST vs PST files OST to PST Converter Export Calendars from OST to PST Import old OST file into Outlook Import OST into Exchange Outlook data file OST cannot be opened Outlook 365 Cached Exchange mode

I. Prerequisites to migrate OST to Office 365

Before you import the mailboxes from OST to Office 365, you must prepare the target Office 365 server as described in the following section.

      1. Ensure that you meet the network and bandwidth requirements for the migration. See network and migration planning, performance factors and best practices for Office 365 migration.
      2. Prepare your target Office 365 tenant. See tenant roadmap for Microsoft 365.
      3. Purchase an Office 365 licensing plan specific to your needs. You can also sign up for a 30 day free trial and decide to go with a suitable one later. Compare Office 365 business plans and Compare Office 365 enterprise plans
      4. Create mailboxes for your users in your organization and assign suitable licenses to them.

          Add users and assign licenses to Office 365 users

          Add several users at the same time to Office 365

          Assign Microsoft 365 licenses to user accounts

      5. If you plan to import Public folders from the OST file into Office 365, ensure that you create and configure the Public folder mailboxes on the target server.

          Create Office 365 Public folder and assign mailbox user

      6. If you plan to migrate In-Place archives to Office 365, enable the archive mailbox on the target server. See steps to enable online archive in Office 365
      7. If you have a custom email domain from the source to which you want to receive emails after the migration, you must add and verify the custom domain on Office 365.

         See steps to add a custom domain to Office 365 and steps to add DNS records to connect your domain

      8. Assign the Organization Management role groupin Exchange online to the admin user. It is an elevated permission that is required for mailbox migration.
      9. Set the impersonation rights for the admin account in Office 365 to migrate mailboxes on behalf of other users in your organization. Verify if the target admin account in general has the following management roles assigned:
        1. Application Impersonation
        2. View-Only Configuration
        3. View-Only Recipients
        4. Public Folders
        5. User management administrator/Global administrator
      10. Check if the Global admin account with the management roles has a valid and non-hidden mailbox on the target server.
      11. Configure Office 365 to send and receive large messages

         Follow the steps to increase the message size on Office 365 to 150MB.

II. Steps to import OST file to Office 365

  • Step 1: Download EdbMails OST to Office 365 migration tool
    • Download EdbMails and install the application on your computer.
    • Follow the instructions that appear on screen to complete the installation.

       See a detailed list of EdbMails system requirements, for OST recovery, conversion and migration.

      edbmails setup

    • Launch the application and click ‘Login’ or ‘Start Your Free Trial’.

      demo login

    • Select the migration technique as ‘OST to PST, OST to Office 365 and OST to Exchange’.

      select the migration technique

  • Step 2: Select the offline OST file for importing to Office 365
    • Before starting the mailbox import operation, take a copy of the OST file as a backup.
    • Browse and select the OST file from your computer that you want to import to Office 365.

       Tip: EdbMails can repair an Outlook OST file if it has been corrupted, orphaned or is no longer inaccessible. You can directly upload the mail items from OST to O365 without requiring the original Exchange server profile that you configured on Outlook.

      browse for ost file

  • Step 3: Preview and select the mailboxes for migration
    • EdbMails first performs a recovery operation and fully restores the OST file in case it is corrupted. You can preview the mail items such as emails, contacts, folders, notes, tasks, calendars from the application’s preview pane. It is also a handy tool if you are looking to open an OST file without Outlook.
    • Select the required mailboxes / folders and click the ‘Migrate to Office 365’ button to continue.
    • Alternatively, you can right click on the selected mailboxes / folders and select the option 'Migrate Selected Mailboxes / Folders to Office 365 Server'.

      ost to office 365

       Tip: EdbMails provides the following additional options to help you customize the mailbox migration to Office 365 based on a Date and other mailbox rules.

      1. Additional Include and Exclude Filter Options
      2. Filter emails by Date: Import emails to Office 365 by applying the Date filter
      3. Filter emails by Size: Exclude emails and attachments from migration, which are larger than a specified size.
      4. Filter emails by domain name: Extract emails sent to and received from a particular domain.

        inclde and exclude filters

    Add a suitable label to the job for identification. This enables you to quickly load the application’s settings for future export operations. You can view all the labels by clicking ‘View Log’ that contains all the details of the previous operation.

  • Step 4: Connect to the target server and upload the OST to Office 365
    • In the Connect to Office 365 (Target) window, select the authentication method as Auto or Manual registration for modern authentication and the connection method as Mailboxes, Public folder or Archive Mailbox.
    • Enter the global administrator credentials to authenticate.

        Assign Microsoft 365 licenses to user accounts

      auto registration

    • After you authenticate and log in successfully, select one of the methods to load the mailboxes. You can also load and migrate the mailboxes using a CSV file.

      connection methods

      Note: If the Standard folders (such as Inbox, Calendar, Contacts) in the source EDB file are initialized with a different language, follow the details in the link to migrate these folders to the respective system folders on the target (destination) server.

      For Instance: When migrating a source Inbox folder with the name ‘Boîte de réception’ in the French language directly to the destination server, it will not be automatically mapped to the ‘Inbox’ folder on the target server. To ensure proper mapping of the folder with the French name, you must change the regional settings on the target server to match the language of the source mailbox folder, which in this case is French.

        See how to change the language and regional settings on Office 365

       Tip: If this is the first time you’re migrating with EdbMails, the migration is a full migration. On subsequent migrations from the same source to the target, the migration is incremental.

      EdbMails enables you to automatically match and map the mailboxes and folders between the source and target and saves time when you’re migrating a large number of mailboxes. Perform the mapping and start the import operation to Office 365.

      map ost mailboxes

    • That's it! During the migration, you can view the progress, pause and resume the operation, as shown. An appropriate message will be displayed upon completion.
    • Verify the list of migrated folders and mailbox items with EdbMails text-based log report.

       Tip: If you want to export Outlook emails to your computer, learn how to backup Outlook emails to an external hard drive by converting OST to PST files.

      migration process

Benefits of using EdbMails for OST to Office 365 import

  1. EdbMails can fully restore your mailbox data from corrupted and orphaned OST files and enables you to directly migrate OST to Office 365 and Live Exchange.
  2. Easily rebuild Outlook data files and also convert OST to PST from a single application.
  3. You can import mailboxes from OST to Office 365 without size limitations.
  4. EdbMails is compatible with all Windows Operating systems and OST files from Outlook 2021, 2019, 2016, 2013, 2010, 2007 and 2003.
  5. EdbMails does not store your credentials and it uses secure OAuth 2.0 modern authentication with TLS encryption for Office 365 migration.
  6. You can migrate deleted email items and Public folder mailboxes from OST to Office 365.

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Step 1. Download and install EdbMails

Step 2. Click the 'Start Your Free Trial' button

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