Allow sync with IMAP calendars
I just found out that IMAP calendars will no longer sync with Outlook 2016. Calendars are such an important part of business services, I'm not sure why this was removed!
I'm not quite sure what you mean by "IMAP Calendars"? The IMAP protocol only handles email synchronization, it doesn't do anything with Calendar or Contact data. That requires a separate protocol like CalDAV or CardDAV.