How to Request an Increase to EWS Throttling Policy in Office 365 (4377764)

During mailbox or public folder migrations to Office 365, users may experience delays due to EWS throttling policies. These policies limit the number of concurrent operations, leading to slower migrations and potential interruptions.

EWS throttling is a default feature in Exchange Online designed to manage resource usage and ensure server stability. However, during migrations, these restrictions can significantly impact performance.

To improve migration performance, you can request an increase to the EWS throttling policy in Office 365 – Exchange Online by following these steps:

Steps to Request an Increase to EWS Throttling Policy:

1. Log in to the Microsoft 365 Admin Center:
   Sign in using your admin credentials at the Microsoft 365 Admin Center.

2. Create a New Service Request:

   • Navigate to Support and click on New service request.
   • In the search field, type "throttling" and select Increase EWS Throttling Policy from the list.

3. Run Diagnostic Tests:

   • Click Run Tests to initiate the diagnostic process.

4. Set the Throttling Policy Duration:

   • After the diagnostic test completes, choose the desired duration for the policy increase (30, 60, or 90 days).
   • Check the acknowledgment box and click Update Settings to apply the changes.

5. Confirmation of Success:

   • A confirmation message will indicate that the update to the EWS throttling policy has been initiated. Changes usually take effect within 15 minutes.

Alternative Option (if Required):

If prompted that Microsoft needs to manually apply the changes, click Contact Support and create a new service request for assistance.

Verify the Changes:

1. Wait for at least 15 minutes after requesting the throttling increase.
2. Run the diagnostic test again to confirm that the EWS throttling policy has been increased.
3. If successful, a message will confirm that the new throttling limits are active.