A few users are reporting issues with being able to see the availability of other users when the create appointments. They reported the problem after upgrading to Office 2016. They're mailboxes are on Exchange 2010 SP3 UR17 however we're going to migrate to Exchange 2016 first quarter next year. Are there client connectivity issues between Outlook 2016 and Exchange 2010? What can I do to mitigate or resolve this problem for now?