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After upgrading my iPhone 5 from iOS 9 directly to iOS 10.0.1, all my icloud calendars are gone.

They don't show up in the calendars list in the Calendar app, and dragging said list down to force syncing of the calendars doesn't even show the usual spinning loading bar indicator – the whole iCloud section is just missing from the list. Rebooting didn't fix the issue.

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The following finally fixed the issue for me:

  1. Sign out of iCloud (Settings -> iCloud -> Sign Out)
  2. choosing "delete all iCloud data from iPhone"
  3. sign in again
  4. wait a couple of minutes
  • No dice for me - had no effect. – Puffin Oct 18 '16 at 18:20
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If you are missing past events, try this: go to Settings>Calendar>Sync. After an iOS upgrade, it defaulted to Events 2 weeks Back, which is why you may not see other older events. You can change it to 1, 3, 6 months back, or All Events. That restored my missing older events.

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