Forum Discussion
Mac Mail - Outlook Exchange issues
Well, for whatever its worth it just went back to working again. Not sure if it was a Microsoft issue or an Apple issue but Exchange account/Mac Mail - Catalina is working just fine again.
I have seen this behaviour both on Catalina and Big Sur multiple times: My incoming email from my Office 365 account is not shown in Apple Mail. Sometimes a Mailbox->Rebuild make them show themselves, but sometimes this doesn't work. It fixes itself after some time (once it took several days, yesterday it took around 24 hours). I saw even consistent behaviour and same timing on both my iMac and my MacBook (running Big Sur 11.1 for two weeks now). Outlook for Mac on both boxes however showed all incoming email from the same account just in time when they arrived.
So my guess it is interworking issue between Apple Mail and the Exchange part of Office 365, but only intermittently, but still repeating. No idea here to further track this down.
Thanks for adding your experience! I hope we can track it down at some point to pinpoint what the issue is and if there is something that can be done to fix it right away. I stopped having issues but since I've seen it more than once I know it can come back at any point.
- commanderclif
I just did some research: Problem is not occurring on a clean Big Sur MacBook Pro... One suspect could be Little Snitch - do you have this installed on your system?pradig I don't use Little Snitch so I don't think that is the issue. When I was having the issue it was on two macs and my thought at the time was that MS had made a change (or Apple, but there hadn't been an update recently, just one day it worked the next it didn't). I'm not complaining that within two days of the problem starting it stopped, and stopped on both Macs at the same time and I can't say I've seen the problem occur since. Fingers crossed it stays working and whatever "switch" someone flicked, doesn't get switched again!
I'm experiencing it as well - making Big Sur Mail.App effectively useless - restarting it every time I want to pull email that I see on my iOS devices. I only get the sync with O365 once, right after restarting Mail.app.
I wonder if it is because I was on public beta, and Big Sur was installed as an upgrade, not a clean install. What a PITA if that's the only solution.
