I am very frustrated with this.
And i'm surprised that Apple and Microsoft would coordinate in such a poor way and note that Mail works with exchange.
I work as a physician, and we all use iPhones and Exchange. We don't have issues there.
And I use OS X, because Im not a Windows fan.
But in Mail, and Calendar on OS X, some invitations come through, others do not.
Some mail comes through, and others do not. Right now for reasons I cannot explain, there are no emails listed from 9/15 to 10/26. No idea why. Outlook for OS X shows them without a problem. You know how frustrating it is to search for an email, and you cannot find it because its just not listed in Mail? I was in a panic! Luckily its in outlook and exchange webmail just fine.
Rebuild seems to fix some it it, but its not reliable, and the last thing we need in business is "unreliable." I am eventually gonna mess up in my business, because I'm going to miss an appointment, or an important email.
This is a HUGE issue, and I've seen it now in the 2 last versions of OS X.
PLEASE APPLE FIX THIS. Exchange integration errors can effect our workflow, and our performance, and just plain makes us look bad.