How To Disable Exchange Throttling

If you find that your Exchange backups take a long time or if you see throttling errors, use the steps below to help improve your backup.

Throttling is prominent in your initial backup and possibly during your first 1 or 2 incremental backups. Items that get throttled in previous backup runs get picked up in future runs.

Throttling can be identified in your backup job logs with entries such as "The remote server returned an error: (429) " or "Web error occurred: 429 TOO MANY REQUESTS (status: ProtocolError)".

To disable Exchange throttling for your backups:

  1. Log in to Microsoft 365 admin center.
  2. Click the question mark icon in the top right corner, this is represented by a question mark symbol.
  3. In the search bar, type EWS.
  4. Select Increase EWS Throttling Policy.

  1. In the Run diagnostics section, click Run Tests. The tests will take a few minutes to complete.

  1. After the tests have been completed, if Microsoft finds your EWS is being throttled, you will be presented with an option to temporarily change your EWS Throttling Policy. From the drop-down list, select one of the three available options: 30, 60, or 90 days.
  2. Select the check box to acknowledge the changes and click Update. It may take up to 15 minutes to apply the changes to your throttling policy.


If you made this request previously for another purpose, you may need to raise a service request to Microsoft.