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 experienced this problem only in the last couple of days. I decided to clean out some old emails and removed some unused folders etc. The only other thing was a MacOS security update, but I'm convinced that it was playing around with old emails and the resultant rebuilding of indexes within Mac mail that created the problem. I have no problem with the non-exchange accounts I have, nor with the same mails on iOS. It's just the MacOS Mail App. Like others Outlook works. FWIW my Exchange email reports as only being a bit under 1.0 Gbyte which Outlook agrees so I don't think this is about file sizes. I'm on Catalina 10.15.7 but its obviously not just Catalina.
Allan2021 Okay so I was intending to upgrade to Big Sur and just did it. It seems to have fixed the email problem for now, but I noted that this did not stick for others. I'm on Big Sur 11.2 now. Fingers crossed. I think that the fact that an upgrade within the local machine fixes the problem, even if only temporary for some, points the finger towards something on the Apple side of things.