STEP 1: Sign in to the Office 365 Admin page. Click Here
STEP 2: Click on Customize navigation in the feature pane.
STEP 3: Check the Select All and click Save.
STEP 4: Check the Select All and click Save.
STEP 5: Search for EWS Throttling
In the search field, search for EWS Throttling. Select Increase EWS Throttling Policy from the list and press Enter
STEP 6: Click on Run Tests.
STEP 7: Allow the diagnostics test to complete
STEP 8: Once completed
select the option of 30, 60, or 90 days for which the EWS Throttling Policy will be disabled. Ensure the acknowledgment checkbox is checked. Click on Update Settings.
STEP 9: EWS throttling will now be removed for the duration you specified.
STEP 10: The update to the Exchange Web Services (EWS) throttling policy has been initiated. The update will be completed within 15 minutes
STEP 11: Run the test (Step 6) after 15 minutes to verify that the throttling has been disabled.
