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Microsoft 365 (Outlook on the web) - Error - This calendar isn't available Please try again

When a user tries to access the Calendar by using Outlook on the web, that user receives the following error message:

This calendar isn't available. Please try again later.

Additionally, other users may be unable to see that user's free/busy information.
This problem can occur for one or more of the following reasons:
  • Corrupted items in the user's Calendar
  • Corrupted custom views
  • Corrupted navigation pane settings

To resolve this problem, follow the steps outlined within Microsoft documentation.