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Outlook | Web | Outlook.com | Calendar
Scheduling and managing events using Outlook.com calendar
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I understand that after restoring your iPhone, your Outlook.com email and contacts synced again, but the Outlook calendar appears in the iPhone Calendar app with “Unable to update calendars.” I am happy to help you. Could you reply with the following details:
- Whether the same calendar opens correctly at Outlook.com in a browser.
- Whether the affected account is Outlook.com / Hotmail / Live / MSN, or a work or school Exchange account.
- Whether the calendar works in the Outlook for iOS app but not in the Apple Calendar app.
- Whether the account was added on the iPhone as Outlook.com, Exchange, or IMAP.
Meanwhile, follow these steps:
1) Confirm the calendar is still available on Outlook.com web
- Sign in to https://outlook.live.com/calendar/ from a browser.
- Check whether the same calendar opens correctly there.
- If the calendar does not load on Outlook.com web either, the issue is likely account-side.
- You can also check Microsoft service status to see whether there is a wider service issue.
2) Make sure the iPhone Calendar toggle is enabled for the Outlook account
- On your iPhone, go to: Settings > Apps > Calendar > Calendar Accounts > Outlook.com
- Make sure Calendar is turned on.
- Open the iPhone Calendar app.
- Tap Calendars at the bottom.
- Confirm that the Outlook calendar is selected.
Reference: Connect Outlook and Apple iPhone calendars | Microsoft Support
3) Check that the account was not added as IMAP or POP
If the account was added as IMAP or POP, only email will sync. For calendar and contacts to sync, please add the account as Outlook.com or Exchange/Exchange ActiveSync instead.
Reference: Can't sync calendar and contacts with my phone or tablet | Microsoft Support
4) Remove the old mobile sync partnership from Outlook on the web
Because the issue started after an iPhone restore, the previous sync partnership may need to be refreshed. Removing the device partnership will not wipe the iPhone; it only resets the sync connection. After removing it, restart the iPhone and add the account again.
5) Refresh the iPhone Calendar app and adjust the calendar sync range
- Open the iPhone Calendar app.
- Tap Calendars.
- Pull down to refresh.
- Then go to: Settings > Apps > Calendar > Sync
- Switch between a specific timeframe and All Events to force a refresh.
6) Use the Outlook for iOS app as a workaround
If the iPhone Calendar app still shows “Unable to update calendars,” please try opening the calendar in the Outlook for iOS app to see if it syncs there. This can help confirm whether the issue is with the native Apple Calendar sync rather than the Outlook.com calendar.
Please tell me how it goes. If the problem persists, please don’t hesitate to reply to this thread and I will be happy to help. Have a lovely day!
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