outlook calendar went missing

Question

outlook calendar missing after upgrade? to new outlook

Answer 1

Hello Steve Hartshorne

I’m happy to help you with this today. Your calendar likely went "missing" because the New Outlook handles data differently than the Classic version. Specifically, it does not support local-only folders that aren't synced to a cloud server.

To avoid repeating the Q&A Assist's reply, could you confirm have you tried those steps? If yes, what happened?

In addition, please try the following steps:

1, Toggle the Calendar View

Before moving data, ensure the calendar isn't simply hidden in the new UI.

• Click the Calendar icon on the far-left navigation bar.
• In the left-hand folder pane, look under "My Calendars."
• Ensure the checkbox next to your account's calendar is checked.

2, Export from Classic Outlook

If the calendar is empty in the New Outlook, your data is likely still stored in the "Classic" version.

• Use the toggle in the top-right corner to return to Classic Outlook.
• Verify your events are there, then go to File > Open & Export > Import/Export.
• Choose Export to a file > Comma Separated Values (.csv) and select your Calendar.
• Switch back to New Outlook.
• Go to Add Calendar > Upload from file and select your .csv file to sync it to your cloud account.

1. Repair the New Outlook App

If your calendar is cloud-based (e.g., @outlook.com) but still isn't showing:

• Go to Windows Settings > Apps > Installed Apps.
• Find Outlook (new), click the three dots (...), and select Advanced options.
• Click Repair.

Please feel free to let me know how it goes so I can help you further. I truly appreciate your time and understanding.

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Answer 2

Hello!

Check Settings > Calendar to ensure your account is listed and syncing, and make sure your calendars are checked in the Calendar pane. If missing, add your account again. For more advanced troubleshooting, you can clear the cache by closing Outlook, deleting the %localappdata%\Microsoft\Outlook cache folder, then restarting Outlook, or use the Microsoft Support and Recovery Assistant to detect sync or account issues.

Answer 3

After upgrading to new Outlook for Windows, calendar issues can occur for different reasons depending on platform and build.

For Outlook for Mac using Legacy Outlook, there is a known issue where calendars don’t display in the left pane and the calendar view is blank after upgrading to build 16.63. This was fixed in Outlook for Mac build 16.64. Updating Outlook for Mac to at least build 16.64 restores calendar visibility.

If the issue is specifically with Internet calendars not appearing after adding them in new Outlook for Windows, some Internet calendar servers reject Outlook’s modern authentication broadcast so the calendar is never added and no error is shown. In that case, the workaround is:

1. Sign in to Outlook on the web.
2. Go to Calendar.
3. Use Add calendar → From internet (or Subscribe from web) and provide the Internet calendar URL.
4. Save the calendar.

The subscription is then managed by Exchange, and the calendar appears under Other Calendars in Outlook clients.

If the calendar is a standard Exchange/Outlook.com calendar that has stopped syncing or appears empty after migration or changes, reconnecting the Outlook.com account to Outlook for Windows can restore proper sync of calendars and email.

If none of these scenarios match (Mac build issue, Internet calendar subscription, or Outlook.com migration), running a calendar diagnostic can help detect problems with permissions, free/busy, delegates, and problematic items:

• Use Microsoft Support and Recovery Assistant’s Outlook Calendar diagnostic (SetupProd_CalCheck.exe) to scan the calendar automatically.
• Or use the Calendar Checking Tool for Outlook (CalCheck) to scan an Exchange-based calendar and generate a report of issues.

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References:

• Calendars don't display in the left pane after upgrading to 16.63 build in Legacy Outlook for Mac
• You can't add an Internet calendar in Outlook 2019, Outlook 2016, Outlook for Microsoft 365, and new Outlook
• Outlook.com shared calendar is no longer editable or syncing after migration
• Scan Outlook calendar by using Microsoft Support and Recovery Assistant
• Information about the Calendar Checking Tool for Outlook (CalCheck)