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Microsoft 365 / Outlook events are not updating in BusyCal

If your Microsoft 365 calendar looks up-to-date in Outlook (and sometimes even in Apple Calendar) but BusyCal isn’t reflecting recent changes, the account may be using a legacy connection method that no longer syncs reliably.

Fix: Re-add the account using Microsoft Graph​

  1. In BusyCal for Mac, open BusyCal > Settings > Accounts.
  2. Select your existing Microsoft/Office 365 account and remove it (minus button).
  3. Click the plus button and add the account again, selecting Office 365 (Microsoft Graph).
  4. Complete the sign-in / MFA flow and allow BusyCal to finish its initial sync.
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