Why Does My Office 365 to Google Workspace Migration Get Stuck at 0%?
Many users find their Office 365 to Google Workspace migration stuck at 0% when using Google’s Data Migration Service. With 6 years of experience as an IT admin handling O365 → GWS moves, here are the most common reasons and quick fixes:

-------------Possible Causes / Fixes----------------

1.Wrong admin role permissions
2.IMAP not enabled on O365
3.OAuth scopes not granted
4.Throttling on Microsoft servers
5.Large mailboxes delaying start
6.Incorrect source login method

-----------------General Quick Fixes-------------------
1.Recheck admin credentials
2.Enable IMAP globally
3.Grant all required scopes
4.Reduce mailbox size
5.Retry after throttling resets
6.Recreate the migration route

If the Google Workspace DMS still stalls, the practical alternative is a third-party solution. The best option I’ve used is the BitRecover Office 365 to Google Workspace Migration Tool. It’s robust, supports advanced filters, batch mode, bulk migration, and handles emails, contacts, calendars, attachments, and more with ease.

Although it follows GDPR and HIPAA standards, it’s still a third-party tool—so feel free to contact Google Workspace Support if you prefer native help. Other tools in the market include SysTools, Advik, and RecoveryTools.