As part of our ongoing efforts to deprecate Exchange Web Services (EWS), starting with March 1, 2026, we will start to block EWS access for all mailboxes without license rights to EWS. This is anothe...
Published Dec 02, 2025
Version 1.0
Blog Post
Hello,
I recently am having an issue where I cannot set the EWS enabled for my users using the command of Set-CASMailbox -EwsEnabled $True (It errors out "License validation error: the action 'Set-CASMailbox', 'EwsEnabled', can't be performed on the user '' with license 'BPOS_S_Deskless"). This is for my users who have F3 Licensing. Has this changed recently or should we expect this to work up until March 1 2026? This is only happening on my F3 users.
If we can no longer set the EwsEnabled property to True for F3 licensed users would I need to re license these users?
I have seen the documentation stating EWS application is not supported for F3 licensed users but I was able to set this property to True up until a week ago.
Some clarification on this would be greatly appreciated.
Thank you,