Migrate SharePoint Sites Between Office 365 Tenants: Admin’s Guide

Organizations always need to change their Microsoft 365 environment due to mergers, business separations, or internal restructuring. In these kinds of situations, moving SharePoint sites between Office 365 tenants is not as easy as transferring files. It requires careful handling of document libraries, permissions, site structure, and important business data. Now, this guide explains the process to migrate SharePoint sites between Office 365 tenants, covers Microsoft’s native migration approach & its limitations, & highlights how SysInfo Microsoft SharePoint Migration Tool can make complex migrations smoother & more reliable.

Why Organizations Move SharePoint Between Microsoft 365 Tenants

SharePoint migration between Microsoft 365 tenants usually traces back to a business event rather than a technical preference. A company acquiring another business often needs to bring the acquired organization's SharePoint sites into its own tenant so both teams collaborate in one place. A divestiture works in reverse, carving a department's sites out into a newly created tenant before the separation closes. Some organizations consolidate multiple tenants that resulted from earlier acquisitions, while others migrate simply because a domain or brand change requires a fresh tenant.

Managed service providers run into a related version of this problem regularly, migrating client environments between tenants as part of onboarding, offboarding, or infrastructure consolidation projects. In each case, the business timeline is usually fixed well before the migration plan is finalized, which puts pressure on the technical team to move data accurately & quickly.

Prerequisites Before You Begin

I can say a few things need to be in place before any SharePoint content moves:

Working through this list before scheduling a migration date avoids the most common cause of failed or delayed cutovers: discovering a missing prerequisite midway through the project. A detailed Microsoft 365 tenant migration checklist is a useful reference for building this plan out further, particularly when Exchange & OneDrive are part of the same project.

The Native Option: Move SharePoint Sites to Another Microsoft 365 Tenant

Microsoft provides an inbuilt SharePoint tenant-to-tenant migration feature that allows administrators to move SharePoint content between Microsoft 365 tenants using SharePoint Online PowerShell. Unlike third-party tools, it does not provide a graphical interface; that's why the migration process requires PowerShell commands, tenant configuration, and proper permissions. The migration happens directly within Microsoft's cloud environment, reducing the need to download & reupload data. This supports large-scale migrations, including up to 4,000 sites in a migration queue, making it suitable for tenant consolidation projects.

Steps to Perform Native transfer SharePoint sites to a new Microsoft 365 tenant

Where the Native Approach Runs Into Limits?

The native feature is genuinely useful, but it comes with constraints that matter for planning to move SharePoint sites to another Microsoft 365 tenant:

• Licensing is restrictive.

  Cross-Tenant Shared Data Migration licenses for SharePoint are currently available primarily to Enterprise Agreement customers & are priced per 100 GB of data moved, which puts the feature out of easy reach for smaller organizations.

• Each site is capped at 5 TB of storage or 1 million items.

  A site that exceeds either threshold times out & fails, so larger sites need to be restructured or split before migration.

• It is a one-time move.

  There is no incremental or delta sync, so any content changed after the migration completes does not carry over automatically.

• Setup is unforgiving.

  The target site cannot already exist, Microsoft 365 groups must be precreated in an exact way, & service encryption with Microsoft Purview Customer Key has to be disabled on the source, or the migration fails outright.

• Permission remapping is only partly automated.

  If SharePoint permissions rely on Entra ID security groups that do not already exist at the destination, those permissions still need to be recreated or reconciled manually.

The native method works well for organizations with the required licensing & a limited number of sites planned for a single migration, but it becomes difficult for larger migrations or projects that require continuous updates during the migration transition.

Dedicated Tool to Migrate SharePoint Sites Between Office 365 Tenants

For projects where licensing, scale, or timeline make the native feature impractical, a dedicated migration tool offers a more flexible path. The SysInfo Microsoft 365 Tenant-to-Tenant Migration Tool for Office 365 tenant-to-tenant SharePoint migration, for example, is a desktop application for Windows & macOS that connects to the source & destination tenants through delegated OAuth 2.0 sign-in & the Microsoft Graph API, rather than requiring a specialized per-gigabyte license.

A typical workflow looks like this:

• Sign in to the source tenant & select the SharePoint sites to migrate, then the destination tenant & map source sites & users to their destination equivalents.
• Apply filters, such as the Content Type Filter, to migrate only documents, only lists, or both & file extension filters to include or exclude specific formats.
• Run the migration & monitor progress through the Active Tasks window & reporting section.
• Use the Skip Previously Migrated option on any follow-up pass, so only new or changed items transfer & nothing is duplicated.

The tool supports incremental migration, allowing teams to perform an initial bulk move & sync only recent changes before cutover to reduce downtime.

Why Choose SysInfoTools for SharePoint Tenant-to-Tenant Migration?

One user says that the task to migrate SharePoint between Microsoft 365 tenants is more than just moving files. Organizations need to keep the site structure, permissions, document libraries, metadata & business-critical content intact while minimizing downtime. SysInfo SharePoint Migrator makes it easier to do so by offering an automated & reliable way to transfer SharePoint data between tenants without the fuss of a PowerShell-based manual migration.

• Easy Migration: Move SharePoint data without complex PowerShell commands.
• Secure Transfer: Establish safe connections between source & destination tenants.
• Maintain Data Integrity: Preserve document libraries, folders, metadata, and its permissions.
• Bulk Migration Support: Migrate multiple SharePoint sites for large-scale projects.
• Minimal Downtime: Complete migrations efficiently with fewer errors & disruptions.

Manual Method vs Dedicated Migration Tool

Best Practices for a Smooth SharePoint Tenant Migration

• Inventory every site before scheduling anything.

  Know the storage size, item count, & permission structure of each site so you are not surprised by a size limit mid-project.

• Handle identity mapping early.

  Precreate users & groups in the destination tenant well before migration day, since permission recreation depends entirely on matching identities.

• Run a pilot migration first.

  Move a smaller, non-critical site before committing the full environment to validate that permissions, metadata, & links behave as expected.

• Split large environments into batches.

  When you are near the per-site size limit or just managing risk, migrating in small sizes transfer are easier to troubleshoot than one large transfer.

• Schedule the final cutover during low-usage hours

  to minimize the window where you means, the users might edit content that has not yet synced.

• Validate permissions after migration,

  spot-checking a sample of sites to confirm that access matches what existed in the source tenant.

• Keep migration reports.

  Whichever method you use, retain logs of what moved & when, both for troubleshooting & for any compliance requirements tied to the migration.

Conclusion

Frequently Asked Questions