When I create a new mailbox using exchange 2016 service; MapiOverHttp is not enabled. Outlook 2016clients cannot connect to mailbox profile when this option is not enabled, while other clients can connect using RpcOverHttp.
It might be a good to have option to enable this selection / option during mailbox plan creation.
PS: To workaround; we still can use powershell to enable MapiOverHttp for a specific mailbox.
Exchange 2016 has MapioverHTTP enabled by default for organizationwide, however the behavior for mailbox to support needs to be enabled by setting MapioverHTTP to $true for the mailbox as well. By default this value is null for a new mailbox.
setting mailbox level MapioverHTTP to $true will then enable Outlook 2016 profile setup, otherwise user gets an error during profile creation. ” Cannot connect exchange, server must be online etc etc””
https://technet.microsoft.com/en-us/library/mt634322(v=exchg.160).aspx article (through the end of page) has a matrix that explains how 3 values on a mailbox affects Autodiscover result..
My experience is ; after creating the mailbox for a user, I set MapioverHTTP value to $true by using
Set-Casmailbox <user ID or mailbox ID>-MapiHttpEnabled <parameter>
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