Exchange version not supported by current version of MailStore
if you are seeing an error like 'This version of Exchange server (15.21.92.6) is not supported by this version of MailStore' is due to Microsoft updating the Exchange version Office 365 uses for its tenets.
This is a change by Microsoft that was not announced and as a result stopped the existing MailStore Archive jobs from working that use the EWS protocol.
To resolve the issue please update to a release of mailstore after Version 26.2.1