Introduction Exchange Server 2013 Cumulative Update 8 (CU8) and Exchange Server 2010 SP3 Rollup Update 9 (RU9) introduced a new feature to provide a more seamless experience for ActiveSync-enable...
Updated Jul 01, 2019
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Cool, this is a step in the right direction. However.. O365 requires a UPN to log in to Activesync. And I doubt many users type in their full UPN to sync their on-premise Exchange email, I might be mistaken but the majority of users will have entered a
"domainuser" username format.
But I guess we can tell users to use the UPN format in preparation for a more seamless migration.