[rryyan]

The key part that's worth knowing about:

> I did some googling and the pieces slowly began falling into place. It turns out there’s a horrific bug in recent Outlook versions’ handling of read receipts: unread messages deleted from an IMAP folder can send a “not read” MDN, even if you’ve explicitly configured Outlook not to do so.

Yikes, that's annoying.

[eli]

Outlook support for IMAP is extremely poor. It always has been.

I'm truly not one for conspiracy theories, but the fact that IMAP is barely compatible with Outlook certainly can't be hurting Exchange server sales.

[xpaulbettsx]

It doesn't help that IMAP servers are banned inside Microsoft, so absolutely nobody uses it (you could still connect to external IMAP servers from inside MS, but I don't know anyone who does it)

[arethuza]

Doesn't really surprise me, Exchange and Outlook are pretty much a linked server/client pair - it is hardly surprising that Microsoft pays little attention to minority of people who use one without the other.