When you install a Cumulative Update for Exchange Server 2016 you might receive the following informational message:
MAPI over HTTP, the preferred Outlook desktop client connectivity with Exchange server, is currently not enabled.
Consider enabling it using: Set-OrganizationConfig -MapiHttpEnabled $true
For more information, visit: http://technet.microsoft.com/library(EXCHG.150)/ms.exch.setupreadiness.WarnMapiHttpNotEnabl
This modern protocol for Outlook has been introduced to Exchange Server with Exchange Server 2013 SP1. The protocol removes the dependency to the Windows Server RPC over HTTP component. The reduced complexity enhances the reliability of the client access protocoll. It's available for quite some time now.
You can enable MAPI over HTTP on the organization level using the following Exchange cmdlet:
Set-OrganizationConfig -MapiHttpEnabled $true
You can still controll the protocol setting at the user level by deactiviting MAPI of HTTP for certain users, if required:
Set-CASMailbox -Identity [USER] -MapiHttpEnabled:$false
If your IT infrastructue is still not ready for MAPI of HTTP, your IT components pretty outdated. It's time to move forward and to modernize the infrastructure.
What are you reasons to not enable MAPI over HTTP? Let me know.
Enjoy Exchange Server 2016!