I'm having 4 problems with O365 and Mac OS X Email, all related to display and status issues. To be clear, I'm using the built-in Mac Mail client, connecting to Office 365 as an Exchange server (vs. not using Microsoft Office email, nor O365 web interface) It's generally working, I get my company calendar events and contacts as well as email. The first 3 problems are fixed if I exit Mail and restart (not sure about the 4th)
Problem 1: (most serious) Sometimes a reply to a thread appears suddenly appears above that thread's header. If I restart, the message is properly shown under the thread header. This happens at least once a day. If this is the top thread in my inbox, the email is still indented, but way at the top, not under any thread heading.
Today I saw a really weird variant of this. The email reply moved from it's proper thread so that it appeared to be part of the thread above, but still properly sorted by date/time within that other thread. Exiting and restarting moved it back to the proper thread.
Problem 2: In the message viewer window, sometimes the To field improperly displayed, with superimposed text. I think it's the person's name and email address, but hard to read. If I restart email, the message displays fine.
Problem 3: Sometimes the content of a message is not visible in the message viewer window, and appears blank. If I restart, the message is visible.
Problem 4: (minor) Sometimes the read status doesn't clear once I've read a message. If I right click in the inbox and specifically change the status to Read, the indicator goes away.
I realize there a chance for finger pointing here, Apple fans saying it's Microsoft's fault vs. Microsoft fans says it's Apple's fault. But I decided to post to the Apple community, in part because I think there's maybe a better chance of getting an answer, and also because when I restart Mac Mail the problems go away. (that doesn't make it Apple's "fault", but makes it a very localized symptom). Also, I haven't heard any of my coworkers complain (using various OS X, iOS, Windows, Android phones, etc)
Of all the issues, item 2 seems the hardest to blame on Microsoft. The data is clearly there, it's being displayed, just incorrectly.
Any advice would be helpful. I'm getting to the point, some days, I have to restart email every couple of minutes. Other times I can go days without seeing these problems.
This is was originally on OS X 10.8.3 Mountain Lion, although still an issue with 10.8.5
I originally posted this back in May at Apple on https://discussions.apple.com/thread/5038346 but I didn't get a solution and some days the problem is really bad. Sometimes I have to exit and restart email every couple of minutes for a spell.