Calendar Problems

How to Fix Shared Outlook Calendar Events Reappearing or Disappearing

Jason Miller Oct 21, 2026 868 views

Question details

The user needs to resolve an issue where changes made to a shared Outlook calendar fail to save properly, causing events to unexpectedly vanish or return after deletion.

How to Fix Shared Outlook Calendar Events That Reappear or Disappear

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Modifying or viewing events on a shared calendar across multiple devices or platforms.
Observed behavior: Calendar changes do not synchronize correctly; events either disappear after being created or deleted events reappear on one or more devices.

Before you start

Ensure you have a stable internet connection and wait at least 15 minutes before troubleshooting to confirm whether the issue is simply a temporary server synchronization delay.

Solution 1Recommended

Disable Shared-Calendar Improvements in Classic Outlook

Turning off the shared-calendar improvements feature in Outlook's advanced settings often resolves persistent synchronization glitches.

Microsoft's shared-calendar improvements feature is designed to speed up syncing, but it can occasionally cause conflicts resulting in ghost events or missing entries. Disabling this feature forces Outlook to use the traditional, more stable syncing method.

Navigate to Account Settings

Open the classic Outlook desktop application, click on the 'File' tab in the top-left corner, select 'Account Settings', and then click 'Account Settings' again from the dropdown menu.

Open Advanced Account Settings

In the Email tab, double-click your specific email account from the list. Click on the 'More Settings' button and navigate to the 'Advanced' tab in the new dialog box.

Disable the feature and restart

Uncheck the box labeled 'Turn on shared calendar improvements', click 'Apply', and then click 'OK'. Restart Outlook for the changes to take full effect.

Disable Shared-Calendar Improvements in Classic Outlook

Synchronization Time: After restarting Outlook, allow up to 15 minutes for your calendar to fully synchronize with the Exchange server.

Solution 2

Unshare and Reshare the Calendar via Outlook on the Web

Resetting the calendar share connection through the web portal forces a fresh sync between users.

Solution 3

Verify and Update User Permission Levels

Ensuring the affected user has the correct editing permissions prevents their local changes from being rejected by the server.

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Frequently Asked Questions

Why do my Outlook calendar events keep disappearing right after I create them?

This usually happens due to synchronization delays, insufficient permission levels on a shared calendar, or bugs within the 'shared-calendar improvements' feature in the Outlook desktop app.

How long does it take for a shared Outlook calendar to sync?

Depending on the server load and your internet connection, it can take up to 15 minutes or more. It is highly recommended to wait a short period before assuming there is a synchronization error.

Can I fix calendar sync issues directly from my mobile phone?

While you can check basic permissions on mobile, deep technical settings like disabling 'Shared-calendar improvements' must be adjusted from the classic Outlook desktop application.

Outlook & Email Problems