Update 1/20/2022: We have edited this post for clarity based on customer feedback.
Over the last few years, we have invested heavily in Microsoft Graph to enable developers to access the rich data ...
Updated Jan 20, 2022
Version 5.0
Blog Post
Abheek_Das
Microsoft
Microsoftstukey , Tom_R_ , JonasBack - We will send Message Center posts to impacted tenants with a list of applications using any of these 25 EWS APIs mentioned in the blog post. As for the question on Outlook usage – currently we have announced only a small subset of EWS APIs for upcoming deprecation, not EWS all up. Outlook very much still uses EWS, but none of the APIs included in this announcement. Outlook (win and mac) moving off EWS is beyond the scope of this announcement.
MichelZCF , WGroenestein - As mentioned in the blog, creation of new apps using EWS is planned to be blocked from September 30th, 2022. So, yes, new Azure AD apps can’t be created using EWS permission scopes. Existing apps using EWS apps permissions will however continue to function beyond this date & not be impacted. This is only relevant for Exchange Online.
Apps running on Exchange On-Prem won’t be affected by any of this announcement and will not need to change. New solutions should actively look into on-boarding to Microsoft Graph directly for Exchange Online.