Update 9/22/2026: We have revised our plans and will not be enforcing EWS restrictions to Kiosk / Frontline licensed users. EWS access will be restricted as a part of the overall EWS deprecation time...
Updated Sep 22, 2026
Version 6.0
Blog Post
Is there are report or process I can use to determine if the change will impact our tenant? I am not sure which (if any) of our Exchange licenses are using EWS. We have many F3 licenses. I need a report or process I can use to gauge impact and communicate to the organization so they can decide if they want to upgrade to or more expensive license, deprecate or choose another path. Before the deadline I'd like to know the impact. If there is a way to get the info from Audit Logs or from the current "EWS Usage" report please help a brother out. I can open a support case if needed.
- davidvasta
Microsoft
Yes, in O365 under the ADMIN Section, not Exchange there is a report. REPORTS > EXCHANGE > EWS Usage
The report provides a comprehensive list of all registered apps using the EWS API for this tenant.
That report should be helpful when trying to find out more about the EWS and your mailboxes. Adding Plan 1 or Plan 2 to those mailboxes will allow the KISKO and F3 license to still have EWS access, but keep in mind we are less than a year away from turning it off for good and the plan has been in place since 2018. Moving those applications to REST or GRAPH is critical now.
There are also tools here that can help with EWS Discovery:
https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-ews-exchange-online#ews-deprecation-timelineI saw the EWS usage report and it looks like just application IDs are in there, I do not see any mailboxes. It says we have 6 applications.
Will that show mailboxes as well?
