Calendar Problems

Fix New Outlook Calendar Appointments and Reminders Disappearing

WPS Content Manager Oct 1, 2026 868 views

Question details

Users are experiencing missing calendar appointments, vanishing reminders, and synchronization failures across contacts and OneNote notebooks in the New Outlook.

How to Fix New Outlook Calendar Appointments and Reminders Disappearing

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Managing calendar events and syncing notes across devices using the New Outlook client.
Observed behavior: Calendar appointments and reminders disappear, and secondary apps like OneNote fail to update or sync correctly across devices.

Before you start

Ensure you have a stable internet connection and access to your Outlook Web account to verify if the appointments still exist on the server.

Solution 1Recommended

Revert to Classic Outlook and Contact Support

Since the New Outlook is still undergoing updates, reverting to the classic version can temporarily resolve missing calendar items while you escalate the issue.

The New Outlook introduces a modern interface but may exhibit synchronization bugs during its wider rollout. Microsoft Support often recommends reverting to the classic version until specific calendar and OneNote sync glitches are fully patched.

Open New Outlook

Launch the New Outlook application on your computer.

Locate the toggle

Find the 'New Outlook' toggle switch located in the top right corner of the application window.

Switch to Classic

Click the toggle to turn it off. Outlook will prompt you for feedback and then restart in the classic version.

Escalate to Support

Continue your open support ticket with Microsoft Support. Provide them with your specific device, operating system details, and any synchronization error codes you encounter.

Revert to Classic Outlook and Contact Support

Gathering Diagnostics: When working with the support representative, be sure to provide screenshots of the missing items and exact error messages to help them investigate the issue thoroughly.

Solution 2

Verify Server Synchronization via Web

Check if your appointments and notes are safely stored on the web server to rule out local application display glitches.

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Frequently Asked Questions

Why are my Outlook calendar appointments disappearing?

This is a known synchronization issue within the New Outlook client. Local caching errors or communication failures with the Microsoft Exchange server can cause items to temporarily vanish from the desktop interface.

How do I check if my OneNote synced properly?

Log in to OneDrive on the web and navigate to your Notebooks folder. If the notes appear correctly in the web browser, the issue is isolated to your local desktop application's synchronization capabilities.

Can I go back to the classic version of Outlook?

Yes. You can revert by turning off the 'New Outlook' toggle located in the upper right corner of the application window. This will automatically restart the app in the classic interface.

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