Calendar Problems

Fix Outlook Shared Calendar Not Updating Delegate Attachments

Maira Mehtab Sep 20, 2026 868 views

Question details

Users are experiencing synchronization issues where attachments modified by a delegate in an Outlook shared calendar fail to update or appear for other users.

Product: Microsoft Outlook
Device & OS: not provided
Scenario: A delegate modifies calendar event attachments in a shared environment, but the changes do not sync across other users' views.
Observed behavior: Changes to attachments made by a delegate in the shared calendar are not reflecting for the calendar owner or other users with access.

Before you start

Ensure that all affected users have a stable internet connection and that Outlook is running in Online Mode or is actively connected to the Exchange server before attempting advanced troubleshooting.

Solution 1Recommended

Verify Delegate Permissions and Clear Outlook Cache

Resetting delegate permissions and clearing the local Outlook cache often resolves synchronization issues for shared calendars.

Synchronization issues with shared calendar attachments often stem from corrupted local cache data or outdated permission states.

Microsoft notes that toggling shared calendar improvements or re-adding delegates can force the Exchange server to push a fresh update.

Remove and Re-add Permissions

Have the calendar owner go to Calendar Properties > Permissions, remove the delegate, apply the changes, and then re-add them with the appropriate Editor or Delegate permission level.

Clear Offline Items

Right-click the shared calendar in the folder pane, select 'Properties', go to the 'General' tab, and click 'Clear Offline Items' to delete the local cached copy.

Force Folder Update

Navigate to the 'Send/Receive' tab on the Outlook ribbon and click 'Update Folder' to download the latest data directly from the server.

Check Known Issues: Review Microsoft's official documentation for recent known issues related to Outlook desktop shared calendar improvements, as a specific bug might require a software update.

Free Microsoft Office alternative

Try WPS Office for Seamless Document and Schedule Management

While Outlook handles complex Exchange calendars, you can manage your daily tasks, documents, and schedules efficiently with WPS Office. It is a lightweight, fully compatible suite designed to handle all your office needs without the synchronization headaches.

1. Download WPS Office: Visit the official WPS Office website and click the free download button.
2. Install the Software: Run the installer and follow the on-screen instructions to set up WPS Office on your device.
3. Explore Templates: Open the application and browse the template library to find high-quality calendar and planner formats.

Fully compatible with Microsoft Word, Excel, and PowerPoint formats.Lightweight design ensures fast loading and smooth performance.Built-in templates for creating schedules, planners, and offline calendars.Free to use with a familiar, easy-to-navigate interface.

microsoft office alternative - wps office

Frequently Asked Questions

Why are shared calendar updates not showing in Outlook?

This typically happens due to Cached Exchange Mode synchronization delays, corrupted local offline files, incorrect delegate permission settings, or known bugs in recent Outlook desktop updates.

How do I force a shared calendar to sync in Outlook?

You can force a sync by navigating to the Send/Receive tab on the ribbon and clicking 'Update Folder' while viewing the specific shared calendar.

Does clearing the Outlook cache delete my calendar events?

No, clearing offline items or cache only removes the locally stored copy of the calendar on your device. Outlook will safely redownload the latest event data and attachments directly from the Exchange server.

Outlook & Email Problems