Using Outlook for Android in business environments for email and scheduling
I fully concur with using BlueMail.
IMAP hasn't worked for over a year now.
Outlook keeps on blaming our ISPs yet the ISP'S settings work seamlessly with BlueMail the first time round.
Outlook used to have descent support, at some stage I used to think it was the best in Microsoft, but alas, it is non-existent.