rohitpatwa
New member
We're preparing for a Microsoft 365 tenant-to-tenant migration after restructuring our organization, and one concern keeps coming up—duplicate data. We already completed a partial migration a few months ago, and now we only need to move newly created mailboxes, updated SharePoint files, and recent OneDrive content. The last thing we want is to copy everything again and waste time and storage.
While researching, I found the MacSonik Office 365 Tenant-to-Tenant Migration tool, and it seems to offer several features that could solve this issue. It has a Skip Previously Migrated (delta migration) option that only transfers new or modified data instead of reprocessing everything. It also includes deduplication for mailboxes, SharePoint, and OneDrive, which sounds useful for keeping the destination tenant clean.
Another feature I found interesting is the ability to filter mailbox data by custom date ranges. That could make phased migrations much easier because we only need to migrate recent emails while leaving older content behind until later. For SharePoint and OneDrive, there are filters based on file size, extension, and content type, which should help reduce unnecessary transfers and save bandwidth.
The migration dashboard also appears to provide live progress monitoring with reports showing completed items, skipped data, and any errors. Having that visibility is important when you're handling hundreds of users and can't afford unexpected surprises.
Has anyone here used incremental migration or deduplication during a large tenant migration? Did it actually reduce migration time, and were there any limitations when working with SharePoint document libraries or OneDrive accounts? I'd really appreciate hearing some practical experiences before moving forward with our project.

While researching, I found the MacSonik Office 365 Tenant-to-Tenant Migration tool, and it seems to offer several features that could solve this issue. It has a Skip Previously Migrated (delta migration) option that only transfers new or modified data instead of reprocessing everything. It also includes deduplication for mailboxes, SharePoint, and OneDrive, which sounds useful for keeping the destination tenant clean.
Another feature I found interesting is the ability to filter mailbox data by custom date ranges. That could make phased migrations much easier because we only need to migrate recent emails while leaving older content behind until later. For SharePoint and OneDrive, there are filters based on file size, extension, and content type, which should help reduce unnecessary transfers and save bandwidth.
The migration dashboard also appears to provide live progress monitoring with reports showing completed items, skipped data, and any errors. Having that visibility is important when you're handling hundreds of users and can't afford unexpected surprises.
Has anyone here used incremental migration or deduplication during a large tenant migration? Did it actually reduce migration time, and were there any limitations when working with SharePoint document libraries or OneDrive accounts? I'd really appreciate hearing some practical experiences before moving forward with our project.
