Several Collaboration Protection customers have received messages from Microsoft relating to their use of WithSecure Elements Collaboration Protection.
The message from Microsoft is legitimate, but appears to be automatically generated for any M365 tenant who has any application using Exchange Web Services (EWS). It is not specific to WithSecure Elements Collaboration Protection.
The messaging is particularly important for organizations who create their own EWS applications and are not aware of the schedule being followed by Microsoft.
Read the full article here:
https://community.withsecure.com/en/kb/articles/32680-microsoft-messages-about-elements-collaboration-protection