Using Outlook for Android for personal email and calendar management
Outlook's IMAP support in the desktop version has always been extremely
subpar, to say the least. Therefore, it is only logical for Microsoft to "port"
the poor support to the mobile version. Unfortunately, this is bad news for
all those who use IMAP.
After so many years, I am relatively certain that Microsoft isn't remotely
thinking of changing anything about this situation. It's better to lose a
few nagging customers but sell lots of Exchange and 365 stuff.