Calendar Problems

Fix Outlook Calendar Still Visible After Exchange Permissions Removed

Adam Davis Oct 12, 2026 869 views

Question details

A user can still view another person's calendar even after an administrator has removed their Exchange calendar permissions and PowerShell shows no remaining relationship.

How to Fix Outlook Calendar Still Visible After Exchange Permissions Are Removed

Product: Microsoft Outlook and Exchange
Device & OS: not provided
Scenario: An administrator has successfully revoked calendar sharing and delegate permissions from an employee (such as a secretary), expecting the manager's calendar to no longer be accessible.
Observed behavior: The employee retains visibility of the manager's calendar items, which may be caused by cached Outlook data, synchronization artifacts, shared mailbox settings, or lingering group permissions.

Before you start

Ensure you have administrator access to the Exchange or Microsoft 365 admin center, and ask the affected user to fully restart their Outlook application to clear any temporary active sessions before troubleshooting.

Solution 1Recommended

Clear Outlook Cache and Disable Cached Exchange Mode

Force Outlook to update its local cache and remove orphaned synchronized calendar items that remain after permissions are revoked.

Often, calendar logs show that items were copied or processed by the Sharing Synchronization Assistant. If permissions are removed, the local local Outlook client might still hold onto a cached (.ost) version of the calendar.

Disable Cached Exchange Mode temporarily

Open Outlook, go to File > Account Settings > Account Settings. Select your email account and click 'Change'. Uncheck the box for 'Use Cached Exchange Mode' and click 'Next', then 'Finish'.

Restart Outlook and verify

Close and reopen Outlook. Check if the manager's calendar is still visible in the online mode. If it disappears, the issue was related to the local cache.

Clear Offline Items

If you wish to keep Cached Mode on, re-enable it. Then, navigate to the Calendar view, right-click the problematic shared calendar, select 'Properties', and click 'Clear Offline Items' to force a fresh synchronization.

Clear Outlook Cache and Disable Cached Exchange Mode

Synchronization Delay: It can sometimes take up to 24 hours for Microsoft 365 backend permission changes to fully propagate to local Outlook clients.

Solution 2

Verify Delegate, Group, and Shared Mailbox Permissions

Check alternative access paths that might grant calendar visibility outside of direct folder-level calendar permissions.

Solution 3

Escalate to Microsoft 365 Support

Open a service request for a backend server investigation if PowerShell confirms no permissions exist but the calendar remains accessible.

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Frequently Asked Questions

Why does PowerShell show no calendar relationship, but the user still has access?

This commonly occurs when the local Outlook client retains a cached copy of the calendar in the OST file, or because previously synchronized calendar items were orphaned by the Exchange Sharing Synchronization Assistant and never properly deleted from the viewer's mailbox.

How long does it take for Exchange permission changes to take effect?

While changes made via PowerShell or the Admin Center apply to the Exchange server almost immediately, background sync processes and Outlook's Cached Exchange Mode can cause a delay of up to 24 hours before the calendar is fully removed from the user's view.

Can a shared mailbox cause overlapping calendar permissions?

Yes. If a user is granted 'Full Access' or 'Read and manage' permissions to an entire mailbox rather than just the specific calendar folder, they will inherit full access to the calendar, overriding any individual calendar folder restrictions.

Outlook & Email Problems