Outlook no longer syncing to Internet Calendars (esp. Google Calendar)

March 31, 2023 9:20 PM

Have others had issues over the past two months or so, where Outlook (2021, but I believe this applies to other versions) will no longer download Internet Calendars that you have subscribed to? I've search and found several different items but almost all say 'delete the calendar and add it again' which doesn't work. There's one item on Microsoft's site which says there's some sort of authentication protocol issue but provides no way to solve it. This happened with one of the more recent Outlook or Windows updates I think. If you know how to solve it let me know.
posted by TimHare to Computers & Internet (2 answers total)

Basic Authentication Deprecation in Exchange Online is almost certainly the cause of this.

- Google use Oauth 2.0
- Microsoft use 'Modern Authentication' and are in the process of disabling basic auth for all protocols.

Microsoft have recently added Oauth 2.0 support to Office 365 online, but knowing Microsoft it won't appear in a stand-alone version of office until the next version is released.
posted by Lanark at 5:19 AM on April 1, 2023 [2 favorites]

Best answer: Revisiting this a random search result recommended that I repair the Outlook data file - even though I had no other problems. Repairing it solved the problem - too bad the symptoms and error messages don't point you in that direction. Marking this as best answer since it is resolved
posted by TimHare at 12:13 PM on June 20, 2023