HOW TO: Lift O365 Throttling Restrictions
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Microsoft has made it possible to easily lift EWS throttling limits for up to 90 days during a migration from O365 admin portal.
- Open the Microsoft 365 Admin Center. You need to be using the new Admin Center - make sure you've enabled "the new admin center" switch in the top right of the home page.
- Click the Need help panel in the bottom right hand corner
- Enter "EWS throttling" in the Need help section. This will launch the EWS throttling wizard.
- Click the Run Tests button. Office 365 will run several diagnostic tests to confirm that throttling isn't already disabled in your tenant and that you haven't already completed this wizard in the past.
- Once the diagnostics have run, choose 30, 60, or 90 days in the Duration dropdown box and click the Update Settings button.
- EWS throttling will now be removed for the duration you specified.
NOTE: you can run the EWS throttling policy only once from self-service diagnostics tool. Once throttling is reapply after configured duration, you will need to open a support request with Microsoft to extend EWS throttling policy"