Free Microsoft 365 tenant to tenant migration

(Average Rating 4.2 Based on 38 Reviews)

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Office 365 Tenant Migration Tool

The enterprise-grade cross tenant migration software for migrating accounts between different tenants. Move source tenant data to destination tenant without routing data through any third-party cloud or server. Migrate 2 user accounts for free using the demo version.

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Enterprise & Bulk Pricing

  • Full-Scope Migration: Move O365, Teams Chats, SharePoint Sites, & More.
  • Enterprise Security Guarantee: ISO 27001 Certified with OAuth 2.0 Validation.
  • Zero-Downtime Cutovers: Automated Delta Passes and Concurrent Routing.
  • Affordable Licensing: Flat Per-User Pricing; No M365 Cross-Tenant Add-on Fees.
  • Skip Scripting: GUI to Map Hundreds of Users Instantly with 24/7 SLA Support.
🔐

FreeViewer Microsoft 365 tenant migration tool allows migrating 2 accounts for free and test its working and compatibility.

Why Pick Free Tenant Migrator Tool? Awards

Rated the Best Office 365 Tenant Migration Software by Users and Experts Alike

migration accuracy verified by CNET experts

“FreeViewer's Office 365 Tenant to Tenant Migration Software has been voted as the most practical tool to transfer data between Microsoft 365 Tenants on CNET.”

High Success rate certificat by SoftwareSuggest

“On SoftwareSuggest, users mention that the speed and safety features of the FreeViewer M365 Tenant Migrator is nothing less than the best in the business.”

100% clean software marked by WeSuggestSoftware experts

“Free Office 365 Cross Tenant Migration Software by FreeViewer has been consistently the number 1 utility to migrate data between two Tenants says WeSuggestSoftware.”

Built for the Right Office 365 Tenant Migration Audience

Whether this is your first tenant migration or your fiftieth, FreeViewer M365 Tenant Migrator fits your needs.

In-House IT Admins

Running a one-time self managed M&A, rebrand, or divestiture? Handle the full migration yourself without hiring a consultant or buying expensive Microsoft add-on licenses. A GUI that any admin can run in under 5 minutes.

Managed Service Providers

Perform migrations for multiple clients every month. One-time licensing eliminates recurring SaaS costs while keeping projects profitable.

System Integrators

Execute enterprise-scale migration projects with concurrent processing, delta sync, priority routing and detailed CSV audit reporting.

What is Office 365 Tenant Migration?

Understand All About Microsoft 365 Tenant and Its Data

An Office 365 tenant migration — also called a cross-tenant migration or tenant-to-tenant migration — is the process of moving user accounts, mailboxes, and collaboration data (emails, calendars, files, Teams chats, SharePoint sites) from one Microsoft 365 tenant to a completely separate Microsoft 365 tenant.

Each Microsoft 365 tenant is an isolated environment with its own domain, user directory (Entra ID), licensing, and data boundaries. Because tenants are entirely separate, moving data between them requires specialized tooling — you cannot simply copy-paste or use native Microsoft admin tools for most scenarios.

IT admins most commonly need an Office 365 tenant migration in these situations:

  • Mergers and Acquisitions — two companies consolidate into one Microsoft 365 environment.
  • Divestitures and Spin-Offs — a business unit is separated and needs its own standalone tenant, which may require administrators to remove a domain from office 365 tenant.
  • Company Rebranding — the organization moves to a new domain and a fresh Microsoft 365 tenant, or decides to rename o365 tenant.
  • Tenant Consolidation — multiple tenants accumulated over time are merged into one to reduce costs and safely combine two office 365 tenants.
  • Microsoft 365 Subscription Upgrades — moving from a legacy Office 365 plan to a modern E3/E5 tenant, or when looking to transfer office 365 subscription another account.
  • MSP Client Offboarding — a managed services client takes ownership of their environment.

How Does Office 365 Tenant to Tenant Migration Work?

A complete tenant migration typically involves four phases: assessment, preparation, execution, and post-cutover validation. Here is what each phase involves:

P1

Pre-Migration Assessment

Before any data moves, you need a clear picture of the source environment. This means auditing the total number of user mailboxes, shared mailboxes, archive folders, OneDrive volumes, SharePoint sites, and Teams channels that need to move.

Key pre-migration tasks include:

  • Inventory all source users and map them to destination accounts.
  • Verify destination tenant licensing — users need active mailboxes on the target tenant to receive migrated data.
  • Register an Azure Active Directory application on both source and destination tenants (you will first need to find microsoft 365 tenant id) and grant the required API permissions (Mail.Read, Mail.ReadWrite, Mailbox.Migration).
  • Identify any VIP or executive accounts that need priority migration treatment.
  • Review any third-party integrations (CRMs, HR systems, security tools) that connect to the source tenant and will need reconfiguration post-migration.
P2

Migration Preparation and Coexistence Setup

During execution — especially for large organizations migrating in batches — users on the source and destination tenant need to work together without disruption. This period is called coexistence.

Coexistence requires:

  • Mail routing between source and destination domains so emails reach the right mailbox during the transition.
  • Calendar free/busy sharing so users on both tenants can see each other's availability.
  • A Global Address List (GAL) sync so users can find contacts across both tenants during the cutover window.

Poorly configured coexistence is one of the most common causes of business disruption during Office 365 tenant migrations.

P3

Data Migration Execution

This is the phase where data actually moves from the source tenant to the destination. Modern tenant migration tools handle this through a secure, direct tenant-to-tenant connection — no intermediate cloud storage, no routing data through a third-party server.

A well-executed migration will:

  • Migrate primary mailboxes, In-Place Archive folders, shared mailboxes, and public folders.
  • Preserve folder hierarchy, metadata, read/unread status, and email threading.
  • Migrate OneDrive files with permissions and sharing settings intact.
  • Transfer SharePoint Online sites including document libraries, permissions, and site structures.
  • Move Microsoft Teams personal chats (1:1) and channel conversations with full message history.
  • Run delta sync passes — incremental migrations of any new data that arrived during the initial pass — to minimize the cutover window.
P4

Post-Migration Validation and Cutover

After data migration completes, the final phase involves validating data integrity, decommissioning the source tenant or converting source mailboxes to forwarding stubs, and ensuring users can operate normally on the destination tenant.

Post-migration checklist items typically include:

  • Verify email, calendar, and Teams functionality for a representative sample of users.
  • Update MX records and DNS to route new email to the destination tenant.
  • Reconfigure any third-party applications that authenticate against the old tenant.
  • Remove or convert source user accounts once migration is confirmed successful.
  • Export the migration summary report for compliance and audit purposes.

How Long Does an Office 365 Tenant Migration Take?

Migration duration depends on three variables: the total data volume, the number of users, and the configuration of your migration tool (particularly whether it supports concurrent routing and throttling bypass).

As a general guide:

  • A single 50GB mailbox typically migrates in 4 to 8 hours under normal Microsoft API throttling conditions.
  • A 100-user organization with average mailbox sizes can typically complete migration in 2 to 5 days, including delta sync passes.
  • Enterprise migrations with thousands of users are typically executed in waves over several weeks, with VIP accounts migrated first in a pilot wave.

Tools that support Microsoft API throttling bypass and concurrent parallel routing can significantly reduce these timelines — sometimes by 40 to 60 percent compared to standard sequential migration approaches.

What Data Can Be Migrated Between Office 365 Tenants?

The scope of what can be migrated varies by tool. A comprehensive Office 365 tenant migration tool should support:

As a general guide:

  • Exchange Online mailboxes — emails, calendars, contacts, tasks, notes
  • In-Place Archive mailboxes
  • Shared mailboxes (to user or to shared mailbox in destination)
  • Public Folders
  • OneDrive for Business — files, folder structures, sharing settings
  • SharePoint Online — sites, document libraries, permissions
  • Microsoft Teams — 1:1 personal chats, channel messages, files, tabs
  • Distribution lists and security groups (membership and configuration)

Note that identities (user accounts themselves) are not migrated — destination user accounts must exist before the migration begins. The migration tool moves content into those pre-created accounts.

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Know Before Choosing An Office 365 Tenant Migration Tool

Not all migration tools are built equally. Before committing to a solution, ask:

Does it require Microsoft's cross-tenant add-on license, or does it bypass that requirement?

Does it migrate Teams chat history — not just files and channels, but actual message content?

Does it support delta sync passes so the cutover window is measured in hours, not days?

Is pricing per-user one-time, or is it a recurring SaaS subscription that continues after the migration ends?

Does it run on-premises (keeping your data direct tenant-to-tenant) or does it route data through the vendor's cloud?

Does it support VIP account priority routing so executive mailboxes are migrated first and validated before the main wave?

What does the audit trail look like? Can you export a per-item success/failure CSV for compliance?

Free Office 365 Tenant Migration Tool vs Traditional Methods

Microsoft's native migration options have hard limitations. Use FreeViewer for limitless migration.

Capability PowerShell / Admin Center
(high technical complexity)		 Microsoft Native Orchestrator
(invite-only preview, not GA)		 FreeViewer M365 Migrator
(best in class)
GUI — no scripting required ✗ Command line only ✗ PowerShell only ✓ Full GUI, 3-step setup
Teams chat history migration ✗ Not supported ✗ Not supported ✓ Full 1:1 and channel chat
SharePoint permissions preserved ✗ Manual cleanup required ⚠ Limited ✓ Preserved automatically
Requires Microsoft cross-tenant add-on license ✗ Not applicable ✓ Required (~$6–12/user/month) ✓ Not required — ever
E3/E5 license required on both tenants Varies ✓ Required on source and destination ✓ Supports E1–E5, Business & Edu
Public Folders migration ✗ Manual scripting ✗ Not supported ✓ Natively supported
Delta sync for zero-downtime cutover ✗ Manual re-run ⚠ Basic ✓ Automated delta passes
VIP / priority account routing ✗ Not available ✗ Not available ✓ Tag C-suite mailboxes to migrate first
Failed item retry — one click ✗ Manual ✗ Manual ✓ Dedicated retry pass
CSV audit report of every item ✗ Manual logging ⚠ Limited ✓ Full success/failure CSV export
Pricing Free (but significant admin time) Add-on license required + E3/E5 $35/user — one-time, no recurring fees

Microsoft's native orchestrator is currently in invite-only preview and not generally available. Feature set is subject to change.

Every Office 365 Tenant Migration Scenario — Handled

No two tenant migrations are identical but FreeViewer M365 Tenant Migrator works regardless.

Merger & Acquisition

Two companies become one. Consolidate source and destination tenants with mailboxes, Teams history, SharePoint sites, and shared mailboxes fully intact. Map acquired company users to parent tenant accounts automatically via CSV.

Divestiture & Spin-Off

A business unit is sold or spun off. Extract a defined subset of users — their mailboxes, OneDrive, and SharePoint — into a brand-new standalone tenant, without touching data belonging to employees staying behind.

Rebranding & Domain Move

Company rebrands and moves to a new domain. Migrate all users to a new M365 tenant under the new domain identity, preserving all data, folder hierarchies, and internal sharing configurations.

Tenant Consolidation

Your organization has accumulated multiple M365 tenants over the years. Merge them into a single tenant, eliminating licensing duplication and reducing administrative overhead across fragmented environments.

M365 Subscription Upgrade

Moving from an older Office 365 plan to a new Microsoft 365 E3/E5 tenant? Migrate all user data, archives, and shared resources to the upgraded environment with full metadata and permission preservation.

MSP Client Offboarding

A client is leaving your managed services arrangement and needs their tenant migrated to a standalone environment. Run a clean, fully documented migration with CSV audit output.

Why Pay Monthly Subscription for a O365 Tenant Migration with an End Date?

Tenant migration is not an ongoing service — it is a project. FreeViewer charges once, not forever.

Tool Pricing Model Approx. Cost — 100 Users
FreeViewer M365 Tenant Migrator $7/user — one-time $700 total
BitTitan MigrationWiz Per-mailbox + platform subscription ~$8,000–$12,000
Quest On Demand Migration Enterprise SaaS subscription ~$15,000–$40,000
Cloudiway Per-user SaaS subscription ~$10,000+
Microsoft Cross-Tenant Add-On License ~$6–12/user/month — ongoing ~$7,200–$14,400/year, recurring

*Competitor pricing based on publicly available information and varies by contract. No hidden Microsoft cross-tenant add-on license required with FreeViewer.

Office 365 Tenant Migration Support
When It Matters Most

Every license gets you access to support staff via live chat and email. Our promise is to give you a real response from someone who knows M365 tenant migrations.

Live Chat Support

Resolve any Office 365 Tenant migration question.

Email Support

Response within 24 hours, any query, any time.

Step-by-Step Tutorials

Full walkthrough from installation to post-migration.

Knowledge Base

Videos, Tool setup, Errors, and more.

24/7

One-on-One Support Included

Expert assistance throughout your migration project.

FREE IT ADMIN ASSET

Be Ready for Any Microsoft 365 Tenant Migration Scenario

Avoid the most common points of failure in cross-tenant migrations. Download our comprehensive Office 365 Tenant Readiness Checklist to learn how to correctly audit licenses, prepare domains, and handle legacy protocols before your weekend cutover.

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No Email Required

Everything You Need for a Same or Cross Tenant O365 Transfer

A complete solution to handle any edge-case your Microsoft 365 Tenant environment presents.

OneDrive & Tasks

Migrate files, To-Do lists, and reminders.

Cross-Tenant Licenses

No expensive Microsoft add-ons.

Cross-Platform

Runs on Windows, Windows Server & Linux.

Custom Folder Mapping

Move folders exactly as required.

Date-Range Filters

Migrate specific quarters or fiscal years.

All M365 Plans

Supports Enterprise (E1-E5), Business & Education.

Shared Mailboxes

Convert and migrate shared mailboxes to user mailboxes.

Summary Reports

Export detailed success and failure CSV reports.

Credentials-Free Migration

Migrate users securely without passwords.

Pause & Resume

Safely pause and resume migrations at any time.

Category Migration

Preserve Outlook categories, labels and tags.

Retry Failed Items

Run dedicated retries for skipped or failed items.

How This Office 365 Tenant Migration Tool Works?

3-Step Approach to Perform the Simplest and Safest M365 Data Transfer

1

Select Office 365 Items

Download O365 Tenant Migration Tool. Next, Select Items which you want to Migrate

2

Enter Office 365 Admin ID & Application ID

Enter Source & Destination Office 365 Admin ID and Application ID

3

Start Office 365 Migration

Finally, start the migration progress. After completion save Migration report.

Extraordinary Features of Office 365 Tenant Migration Tool

Best Tool to Migrate Office 365 Account to Another Office 365 Account

Quick migration

Office 365 to Office 365 Migration

The Office 365 Tenant to Tenant Migration tool allows moving Office 365 mailboxes to another account with 100% accuracy. It migrates contacts, emails, calendars and documents from one account to another in a seamless way. This software also maintains the meta properties while migrating data from source to destination tenant.

Add CSV File

Add CSV of Office 365 Mailbox Details

In order to begin the transfer, users have to provide the mailbox credentials for source and destination users. To do this, instead of adding them one at a time manually, users can add .csv file having each detail of Source ID, Destination ID of Office 365 users accounts. Office 365 Tenant Migration Software contains sample CSV template.

Office 365 Shared Mailbox Migration

Office 365 Shared Mailbox Migration

Free tenant migration tool is capable enough to migrate Office 365 shared mailboxes data between Office 365 Tenants. The application supports migration of the Office 365 shared mailbox to user mailbox and Office 365 shared mailbox to Office 365 shared mailbox.

Archive Folder Migration

Office 365 Archive Folder Migration

This advanced tool provides the facility to migrate Office 365 user data stored in user archive folder between Office 365 mailboxes. By using the tool, users can easily migrate Office 365 archive folder emails to another Office 365 archive folder.

selective migration option

Date Filter for Mailbox Items

Free Office 365 to Office 365 migration tool allows users to move data from one Microsoft Office 365 to another account and also help to filter the emails received within a certain date range. With this feature, users can export emails, calendars and documents between "From" to "To" date range by setting up filters accordingly.

complete data migration

Transfer Mailbox Data Items

Office 365 Cross Tenant Migration utility equips an option to export emails, calendars, contacts, and documents. However, if users want to move only selected items, then they can check or uncheck that item from the software pane. It can only migrate selected items, by preserving the complete folder hierarchy.

secure migration

Authenticate & Migrate Mailboxes

As you are adding the source and destination mailboxes, Microsoft Office 365 to Office 365 Migration Software first maps each user mailbox. Once the mapping is done, it will authenticate mailboxes and proceed with data migration. You can also view the migration process in progress status window after clicking on Start Migration button.

migration summary report

Create Complete Summary Report

As you begin the Office 365 transfer; Microsoft 365 to Microsoft 365 migration tool will display the complete details and total count of mailboxes being exported from source to destination. Further, you can see both current or final status report which contains details such as success & failed items, source & destination ID, file name, status, error, etc.

complete data migration from source tenant

Re-Run Migration Facility

This tenant migration tool provides three options for re-run migration:

  • Delta Migration: This option will migrate all newly arrived items from source Office 365 account to destination.
  • Re-Run Full Migration: By using this option you can re-run full Office 365 migration. It will migrate those items which are skipped in initial migration.
  • Retry Failed Items Migration: With this re-run migration option, you can move data which are failed in the initial migration process.
set priority before initiating migration

Option to Set Priority of Accounts

Office 365 to Office 365 migration tool provides an account-based priority option, with this option you can set the priority of Office 365 users accounts to migrate first. To enable account-based priority you have to click on the start icon. Once this option is enabled, the tool will migrate these accounts data first.

migrate all users

Move Multiple Office 365 Users

The tool allows configuring more than one Office 365 user accounts. By applying this option, you can migrate user's account data from multiple Office 365 account at a time. You need a highly configured machine to perform multiple Office 365 project migration.

pause and resume migration

Stop Migration Option

The tool provides a stop migration option with which you can stop all ongoing Office 365 to Office 365 migration process. This option will stop running the migration process of all users' data. You can restart the migration process by clicking on Start Migration button again.

migrate 2 accounts for free

OAuth 2.0 & ISO 27001 Security

Never store global admin passwords. Our Office 365 Tenant migration tool utilizes strict OAuth 2.0 token-based authentication, functioning as a secure pass-through pipeline for corporate data.

all component migration

Teams, SharePoint, & Folders

Move beyond standard Exchange mailboxes. Natively transfer 1:1 Personal Teams Chats, complete SharePoint Online sites, and complex Public Folders during a Microsoft 365 tenant migration.

pre-migration check list

Pre-Migration Assessment & Audit

Scan the source environment before moving data. Calculate volume, identify corrupted items, and verify destination licensing (E3/E5) to prevent mid-project failures during a cross tenant migration Office 365.

no limitations for migration

Bypass Microsoft Throttling

Scan the source environment before moving data. Calculate volume, identify corrupted items, and verify destination licensing (E3/E5) to prevent mid-project failures during a cross tenant migration Office 365.

use free demo version

No Cross-Tenant License Fees

Avoid hidden Microsoft licensing costs. You do not need to purchase expensive native cross-tenant add-on licenses to execute the data transfer across disconnected domains.

detailed migration process

Mail Routing & Coexistence

Maintain business continuity during phased M&A transitions. Retain calendar free/busy states and continuous mail forwarding between the source and target tenant.

Office 365 Tenant Migration Software – System Specifications

Download the Best Office 365 to Office 365 Migration Tool for Free

Processor

Processor

Minimum 4 Core Processor 2.3GHz

Memory & Storage

Memory & Storage

8 GB is Recommended | 500 MB of free hard disk space required

Deployment Prerequisites Deployment Prerequisites

  • If you are using Windows 10/8.1/8/7 or Vista, then please launch the tool as "Run as Administrator".
  • Microsoft .NET framework 4.5 and Above Version.
  • Destination User(s) should be already created at destination Admin account.
  • User Group(s) should be already created at destination account.
  • Register Application with Microsoft Azure Active Directory & Enable API Permission for Source & Destination Domains.
Supported Editions

Supported Editions

  • Windows 11 & 10 (64-bit), Windows 2012 / 2016 Server

FAQs

Q: Is Anti-Virus blocking the export process?

Disable Anti-Virus temporarily or whitelist the software in your settings for proper functionality.

Q: Unable to create output in destination?

Avoid using NAS, SAN, or Network drives. Ensure the source file is on the local migration machine to perform successful migration.

Software Download

Release v7.8.1 | File Size: 165.53 MB

Download For Windows

Trial Limitations

Trial version of this Microsoft 365 migration software can transfer/move data for only two user accounts from one account to another.

Installation Uninstallation User Guide
Electronic Delivery

Electronic Delivery

The delivery of product is automated. You will receive an email containing both the link to download and the activation key within a few minutes.

Choose the Right Office 365 Tenant Migration Tool

Our Free Demo is fully unlocked. Test VIP routing, delta passes, and OAuth 2.0 authentication on 2 users before executing your cross tenant migration Office 365.

Migration Capabilities
Free Demo
Try for Free
Full Version
Production Ready

Pre-Migration Environment Audit

Scan source tenant and authenticate securely using OAuth 2.0 without passwords.

Included Included

Import CSV & Auto-Mapping

Bulk map hundreds of source and destination users instantly via CSV upload.

Included Included

Advanced M365 Workloads

Migrate Mailboxes, In-Place Archives, Teams Chats, OneDrive, and SharePoint Sites.

Included Included

VIP Account Tagging & Priority Routing

Tag C-Suite or critical department mailboxes to migrate first with dedicated bandwidth.

Included Included

Concurrent Routing & Automated Delta Syncs

Bypass Microsoft API throttling limits and run background delta passes for zero downtime.

Included Included

Custom Folder Mapping & Filters

Map custom destination folders and apply specific Date-Range filters for the migration.

Included Included

Detailed Migration Summary Reports

Export comprehensive CSV audits of all successful and failed items.

Included Included

Complete Office 365 to Microsoft 365 Tenant Migration

Total number of user mailboxes permitted to be migrated.

Two User Accounts Unlimited Users

Licensing Cost

No hidden Microsoft cross-tenant add-on fees.

FREE

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$35 / 5 users
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Frequently Asked Questions

Listed Commonly Asked Questions and Answers on FreeViewer Office 365 Tenant Migration

What Customers Are Saying

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1 Star 13.2%
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