Is tenant-to-tenant migration useful during mergers?

Yes. It is commonly required when acquired or merged organizations need users moved into a target Google Workspace environment.

Can source and target email addresses be different?

Yes. Prepare and review explicit source-to-target mailbox mappings when addresses or domains differ.

Should I keep the source tenant after migration?

Keep the source available until the migrated data has been validated and the agreed retention period is complete.

Do administrators need each user's password?

No. The supported API-based workflow is administrator-led and does not require collecting individual user credentials.

Can the migration run in waves?

Yes. A staged approach with pilot users and production waves, combined with concurrent processing, keeps larger projects observable.

How are identity conflicts handled?

Resolve conflicting usernames, domains or display names in the source-to-target mapping before the first production wave so data is not written to the wrong account.

Is technical support available?

Yes. EdbMails provides 24/7 free technical support during tenant-to-tenant migration projects.

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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

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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 offers secure Google Workspace migration to Office 365, Exchange, or IMAP, and export to PST covering emails, contacts, calendars and tasks.

Google Workspace Migration

Migrate emails, calendars, contacts, tasks from Google Workspace to Google Workspace, office 365, Exchange and IMAP. Export to PST

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.

Google Workspace to Google Workspace

Migrate emails, calendars, contacts, tasks between two Google Workspace / G Suite tenants

Google Workspace to PST

Export emails, calendars, contacts, tasks from Google Workspace / G Suite to Outlook PST files

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.

EdbMails Data Recovery

EdbMails 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.

EdbMails Data Recovery

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

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Google Workspace Tenant to Tenant Migration

Move users and supported data between Google Workspace tenants

EdbMails helps organizations manage Google Workspace tenant-to-tenant migration when users and supported data need to move from one organizational environment to another. Administrators can map source accounts to destination users, define migration scope, migrate users in controlled waves, and run incremental passes before the final transition.

Just $299 for 100 Mailboxes

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Plan and execute Google Workspace tenant-to-tenant migration

Google Workspace tenant-to-tenant migration moves users and supported mailbox data from one organization-managed Google Workspace environment to another. It is typically required when organizations merge, restructure, change administrative boundaries, or move users into a new corporate environment.

EdbMails provides a controlled administrator-led workflow for these projects. The goal is not simply to copy data, but to prepare source and target users, map identities correctly, migrate supported workloads in stages, and validate the destination before the final transition.

Download View Migration Tool

What tenant-to-tenant migration covers

A tenant-to-tenant project moves a defined population of users and their supported mailbox data from one managed Google Workspace organization into another. Because both ends are administrator-managed environments, the documented API-based workflow can include email, attachments, calendars, contacts, tasks and label organization. The emphasis is on correct identity mapping and staged execution so that a large move stays observable and reversible up to the point of final transition.

Project scope

Defined user populationMoved from one managed organization to another

Correct identity mappingEvery source user paired with the right target

Staged executionPilot, waves and incremental passes

Observable and reversibleUp to the point of final transition

Supported data in a tenant-to-tenant migration

Data type	Supported	Notes
Email and attachments	Supported	Transferred between source and target tenants.
Calendars	Supported	Validate representative events during the pilot.
Contacts	Supported	Confirm fields on sample accounts.
Tasks	Supported	Included in the documented API workflow.
Labels / folders	Supported	Validate nested and custom labels in the target.

Tenant-to-tenant migration planning

Start with an inventory of source users, aliases, mailbox sizes, calendars, contacts, tasks, custom labels or folders, and the target user structure.

Source users

Aliases

Mailbox sizes

Calendars

Contacts

Tasks

Custom labels or folders

Target user structure

Identify users whose addresses will change and prepare an explicit source-to-target mapping before production migration. A complete inventory is what turns an unpredictable move into a scheduled, wave-based project.

Identity and mailbox mapping

Automatic mailbox mapping can reduce repetitive administration when source and target identifiers align. Always review the proposed mappings, particularly where usernames, domains, or display names differ between environments.

See automatic mailbox mapping in Google Workspace migration.

Step-by-step tenant-to-tenant migration

PrepareSteps 1–4

1Inventory source users, aliases, mailbox sizes and supported data types.
2Prepare the target tenant users and assign required licenses.
3Configure administrator access and the required API permissions on both tenants.
4Build and review the source-to-target mapping, resolving any identity differences.

PilotSteps 5–6

5Run a pilot with a representative set of mailboxes.
6Validate email, calendars, contacts, tasks and label structure in the target.

MigrateSteps 7–9

7Run the production migration in controlled waves.
8Run incremental passes to capture supported new or changed items.
9Verify counts and representative data, then plan the final transition.

Run a pilot before production

Use a representative pilot set that includes large and small mailboxes, custom labels, calendar data, contacts, tasks, and users whose target addresses change. Review both the migration report and the actual target accounts. The pilot is where you confirm that the mapping and supported data types behave as expected before any large wave.

Large and small mailboxesCustom labelsCalendar dataContactsTasksChanging target addresses

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Stage migration with incremental passes

A staged approach reduces cutover risk. Perform an initial bulk transfer, continue allowing users to work in the source, and then use incremental follow-up runs to process supported new or changed items before the agreed transition point.

Initial bulk transferMove the existing data

Users keep workingThe source stays in use

Incremental follow-up runsNew or changed items

Agreed transition pointFinal switch to the target

Use filters when scope must be controlled

Selective migration and filtering are useful when the project excludes older content, particular folders, or specific item categories. See Google Workspace migration settings.

Best practices for tenant-to-tenant migration

Resolve identity conflicts first

Resolve every identity conflict in the mapping table before the first production wave, because misrouted data is far more costly to correct after the fact than to prevent.

Keep the source available

Keep the source tenant available until business owners confirm the target.

Time the final incremental run

Schedule the final incremental run close to the transition so the gap is small.

Plan waves for larger tenants

For larger tenants, use concurrent processing and plan waves by department or region so throughput stays observable and provider-side limits are easier to manage.

Post-migration verification

Compare representative source and target mailboxes, folders or labels, message properties, attachments, calendars, contacts, tasks, and migration counts.

CompareSourceTarget

Mailboxes

Folders or labels

Message properties

Attachments

Calendars

Contacts

Tasks

Migration counts

Keep the source environment available until business owners confirm that the required data has been verified.

Common issues to watch for

The most frequent problems are identity conflicts between tenants, label structures that need validation in the target, and throttling on large waves. Each is manageable when caught in the pilot.

Identity conflicts between tenants

How to handle itResolve mappings up front.

Label structures that need validation

How to handle itValidate labels on representative accounts.

Throttling on large waves

How to handle itSize waves to keep the project observable.

Tenant migration vs domain migration

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Tenant-to-tenant migration

Tenant-to-tenant migration focuses on moving users between two managed Google Workspace environments.

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Domain change

Domain migration

If the main requirement is changing the business domain or rebranding user addresses, see Google Workspace domain migration.

View Workflow

Combining environments

Consolidation migration

For combining several environments into one, see Google Workspace consolidation migration.

View Workflow

Frequently Asked Questions

What is Google Workspace tenant-to-tenant migration?
It is the migration of users and supported mailbox data from one organization-managed Google Workspace environment to another.
Is tenant-to-tenant migration useful during mergers?
Yes. It is commonly required when acquired or merged organizations need users moved into a target Google Workspace environment.
Can source and target email addresses be different?
Yes. Prepare and review explicit source-to-target mailbox mappings when addresses or domains differ.
Should I keep the source tenant after migration?
Keep the source available until the migrated data has been validated and the agreed retention period is complete.
Which data types are supported?
The documented API-based workflow supports email, attachments, calendars, contacts, tasks and label organization. Confirm the exact scope during the pilot.

Do administrators need each user's password?
No. The supported API-based workflow is administrator-led and does not require collecting individual user credentials.
Can the migration run in waves?
Yes. A staged approach with pilot users and production waves, combined with concurrent processing, keeps larger projects observable.
How are identity conflicts handled?
Resolve conflicting usernames, domains or display names in the source-to-target mapping before the first production wave so data is not written to the wrong account.
Is technical support available?
Yes. EdbMails provides 24/7 free technical support during tenant-to-tenant migration projects.