macOS Ventura does not deal well with Microsoft Exchange accounts. Since the official release of the operating system last week, many users have reported errors between their calendar or their Exchange reminder list and Apple’s native apps. MacRumors reports that several users are complaining on Twitter, while topics have been opened on Apple’s support forums.
The bugs are annoying: some Exchange calendars no longer sync properly with Apple’s Calendar or Reminders app. And even if they do coordinate, there have been reports of errors in event dates and times, as well as invitations to events that don’t work out.
The issue appears to only affect Macs running Ventura. In a post, a user explains that everything works normally on his Mac with Monterey, but that the latest version of macOS is in trouble.
Third party apps (Fantastic, Outlook) don’t seem to be affected by the issue, this may be a workaround until Apple fixes the issue. If you haven’t updated yet and are an Exchange user, it might be best to stick with Monterey until Apple releases a patch.