Others I know have had the same issue, and deleting/remaking the account only worked as temporarily: I'm not in a hurry to fix it. I have been using MacMail and Office 365 without incident for some years (since my company decided to disable IMAP off-site :( ) and in the last few weeks it's regularly simply stopped syncing.įor me, reducing the number of emails I have is not an option: yes, I clean up, but I also save a lot - as I need them for later (and as a general point: a fix should not be 'change the way you work', it should be 'fix the software'!). Just to add to this discussion: I have the sync problem as well, and *I do not have any IOS devices*. Maybe Apple could have the developers for the iOS Mail app give a seminar or two to the Mac OS Mail developers. I really, really wish Apple would resolve this. If it is not the cause, then something else out of user control has to be the problem. If that truly is what is going on, it is ridiculously hypocritical, petty, and insulting. Somebody once told me that Apple pays Microsoft licensing fees for using Exchange on iOS, but does not pay the fees on Mac OS. Work arounds are inconsistent such that they seem to work only by coincidence. You can search the forums here and find issues dating back to Catalina. Deleting and reinstalling my Exchange account takes about 3 days to synch and only temporarily solves the problem. I have over 350k messages in archives mostly on my mac and some in the cloud on office 365. For me, it has been going on for years, dating back to when I had my own Exchange server. The only thing that is unreliable is an exchange account in Mail on Mac OS. Web Outlook (which I despise even more) works fine. Using Office 365, and Outlook for Mac (which I despise) works fine. Deleting Mail's saved application state worked for a while a couple of times on Mojave. None of the suggestions work permanently.

My outlook email is not syncing mac ews