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macrumors bot
Original poster
Apr 12, 2001

macOS Ventura causes a number of problems for users who use a Microsoft Exchange account for their calendar or reminders list, according to user reports online.


macOS Ventura is the latest macOS operating system released to the public last week. Since its release, users have taken to Twitter, the MacRumors Forums, as well as the Apple Support forum to share that their Exchange calendar no longer syncs properly with Apple's calendar or Reminders app.

In some cases, when the calendar does sync with Apple's built-in calendar app, other issues still arise, such as event dates and times being synced incorrectly, event invitations not coming through, reminders not syncing, and other related bugs.

It's not clear what Apple has changed with macOS Ventura to cause these issues or whether this is an issue on Microsoft's side. Users who are running macOS Monterey have reported no similar problems, so at least for now, it seems to be a bug with macOS Ventura.

In the meantime, users can try removing and re-adding their Exchange account to their Mac in hopes of resolving the issue. For users still running macOS Monterey and who use an Exchange account, it may be best to wait for the issue to be patched before updating.

Article Link: Users Report Microsoft Exchange Calendar Problems After Updating to macOS Ventura
Last edited:


macrumors member
Sep 23, 2014
I reported MULTIPLE bugs in MacOS vs Exchange to Apple during the early beta's and not a single one have been fixed - still not fixed in 16.1b

Mail: Mails continue to show as "unread" no matter how you try to mark them. Exit mail and open again and things are "right" for a little while.
Calendar : Multiple - but worst is reminders like (1 day of the month) - will keep alerting for the whole first week of that month.

iOS does not have the same issues...


macrumors 68030
Apr 20, 2015
I’d like to see Apple return back to bi-annual releases. macOS was Macs are not phones and these annual releases are more akin to service packs that break everything.
What a short memory you have, those releases were often bug riddled till the first, second or sometimes third point releases. Nothings changed apart from the colour of the lens in your spectacles.


macrumors member
Nov 13, 2011
Nottingham, UK
I’ve had these issues for the past year pre-Ventura too due to macOS not renewing authentication when required (i.e. a user is re-required to enter their MFA code but for some reason macOS fails silently and just stops synchronising all Exchange data except email). That said, I’ve also tested other third party apps and some seem to suffer the same issue, so I don’t think it’s unique to Apple.


macrumors regular
Jun 7, 2011
Great. I already have problems with Microsoft Exchange calendar not syncing properly between devices. I've actually missed things because of it.


macrumors 68030
Jan 22, 2009
I’d like to see Apple return back to bi-annual releases. macOS was Macs are not phones and these annual releases are more akin to service packs that break everything.

Very well put. These annual releases made sense when Mac OS X was in its infancy and needed major features. macOS doesn't need annual releases that cause headaches.


macrumors newbie
Jan 13, 2011
The built in mail and calendar apps work well with iCloud and probably IMAP. They have never worked reliably with Exchange or Google over any long period of time in my experience, both for myself and users I support. It's a shame because the UI is really good, but that's meaningless if you can't count on it. Software testing has a long way to go to catch up with reality, but it's also discouraging to see that reported bugs like these weren't fixed in time for release.


macrumors member
Apr 3, 2022
Same thing every year. Bugs, bugs and more bugs. By the time it’s got to be almost stable a new flavour of macOS comes and bugs, bugs and more bugs. Just stop this yearly update for everything. It wouldn’t affect sales as somebody in august thinking of buying a phone won’t wait another 13 months thinking they wouldn’t have the latest iPhone because they would for another 13 months. It’s just crazy. Every even year 2022/2024 etc renew the macs, iPhones, iPads, iOS, macOS, watchOS, tvOS etc

Due to having 2yrs to refresh the line up, we would see far bigger innovation and far better features rolled out.

Will it happen? Nope. Apple amongst most other companies just see the income. Money, money, money is all they care about. Sad.
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macrumors 6502a
Oct 31, 2018
Toronto, Canada
I was about to say that I wasn’t having any issues, but then I realized this article was referring to using the built in apps with Exchange. I wouldn’t trust that. Just use the Outlook app if using an Exchange server.


macrumors 68020
Jan 12, 2006
I just use Outlook now, not worth the hassle to use mail with Exchange any more. Bonus is that it keeps my work and personal mail totally separate.
Same. I just gave up after a while and just use outlook and teams for work stuff. It's just a bit annoying having to check 2 calendars to see if there's a bad appointment collision.
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