Configuring Outlook 2016 for MAPI/EWS using non cached mode fails.
Problem reported by Torben Nielsen - 3/8/2020 at 9:03 AM
Known
Configuring Outlook 2016 for MAPI/EWS and selecting to NOT 'Use Cached Exchange Mode' causes Outlook to be unable to start: 'The attempt to login to Microsoft Exchange has failed'.
echoDreamz Replied
I believe I remember Tim saying that only cached mode works currently. 
Employee Replied
Employee Post
This is correct.  Only cached mode is supported with MAPI at this time.

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