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Level 1

53 points

Mac Mail not Syncing with Exchange email server on MacOS devices

My work e-mail account is on a Microsoft Exchange server. Starting today, October 21, 2020, this account stopped syncing properly. Other accounts are not affected. The Exchange account is also NOT affected on iOS devices, but is affected on MacOS devices. Interestingly, the MacOS devices were updated overnight, to iOS 14.1, so it is possible that this is interfering with the syncing on the MacOS devices.

Incoming mail on the Exchange account appears correctly in the inbox in iOS devices, but not on the MacOS devices. Outgoing mail appears to work properly in both systems.

Posted on Oct 21, 2020 9:40 AM

Best reply

agodfrin

Level 1

38 points

Posted on Jan 22, 2021 9:38 AM

I had a similar problem when my company moved to an exchange server. After a few days, I found out that I would read email on my mac (and move some to specific folders), but on my iPhone and iPad, those mails would still appear as unread, (and for the ones I moved, they would still be in the inbox).

I then looked at the mail using the outlook web app. What seemed to happen is that anything being done on mac mail was not reflected on the exchange mails: I would for example flag a mail on mac mail: the mail on exchange would remain un-flagged (which is why the other devices did not see the change either). But it worked fine the other way around: flagging a mail on exchange (via the outlook web app) was instantly reflected on mac mail.

To cut a long story short, the only solution that worked was to fully delete the exchange account from the mac, and recreate it.

Note that I never had an issue with receiving or sending emails: that always worked. It was just that reading mail on mac mail was not being reflected in exchange. Let's see for how long that solution lasts ...

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57 replies

jeff216

Level 1

4 points

Jan 20, 2021 5:19 PM in response to Jean Desnoyers

not working for me

Jan 21, 2021 1:54 AM in response to jeff216

With me everything started to work normal again by itself after a few days.

bezef

Level 1

4 points

Jan 22, 2021 1:15 AM in response to tresinnoctem

Had the same issue. Solution was to delete and set up Exchange account again. It looks like authentication process has change hence needed 'refreshing'. It is now working normally on Apple Mail.

Jan 22, 2021 5:33 AM in response to bezef

@bezef let us know if it holds up I tried that before at least 2-3 times and always broke between 7-14 days after

Jan 29, 2021 2:08 PM in response to tresinnoctem

When you deleted the Exchange account on your MacBook did you lose anything?

Jan 29, 2021 2:30 PM in response to baltdawgfan

No, but resynching may take a while depending on the numbers of emails, in my case its over 20k messages to synch back, ouch

Jan 30, 2021 9:06 AM in response to Texas-David

update: I deleted the Exchange account (after saving all emails) and then reinstalled it and seems to have fixed the issue

Feb 15, 2021 9:01 AM in response to -MarkH-

Like a replied earlier, I waited a few days and everything started to work all by itself normal again. I also worked for a few days with Outlook which I really hate to work with.

Feb 16, 2021 5:44 PM in response to chabberdabber

That's good news. Just for kicks, I tried sending emails, and I can send an email through the Exchange account, but I can't receive them.

Feb 20, 2021 7:42 AM in response to Jean Desnoyers

Me too Jean. Just happened a few days ago, tried deleting and re-adding exchange mailbox, got all my new mail but none incoming after that. So frustrating. Did you find any resolution?

Feb 24, 2021 8:29 AM in response to tresinnoctem

Thank you! Your advice helped me.

Regards.

Mar 17, 2021 1:48 PM in response to bezef

That worked for me for 2 months and today the issue resurfaced. If I read an email on my laptop it still shows as unread on the iPhone.

Mac Mail not Syncing with Exchange email server on MacOS devices