Trying to find and remove shared calendar permissions.

Daniel Treccagnoli 0 Reputation points

Hello all

Some users in my organization are able to access full details on users' calendars, not everyone but also people they really shouldn't have full rights on. I have checked their permissions in Exchange settings in PowerShell, as well as on the individual calendars in the local Outlook for the affected users. This appears to be affecting primarily users that were made before my time in this organization. We have a Hybrid Azure AD environment so we sync from On-Prem AD. Not sure where else to look to see why these calendars are visible. Is it something inherited from the On-Prem DC?

A family of Microsoft email and calendar products.
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Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. Vasil Michev 96,436 Reputation points MVP

    If there are no individual (or group) entries on the affected Calendars, the most likely reason is that the Default permission entry has been modified. It should be set to AvailabilityOnly, or None if you want to prevent access altogether.

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  2. Bruce Jing-MSFT 1,075 Reputation points Microsoft Vendor


    Based on my experience, you could refer to the followings:

    1. You can also use ' Get-MailboxFolderPermission -Identity\calendar ' cmdlet in PowerShell to view the permissions of a specific use.
    2. Can you provide the results of your Outlook query? For example the image below: A screenshot of a computerDescription automatically generated
    3. It is recommended that the customer logs into the local AD server, finds the affected user and checks his properties for exceptions. The steps are shown below: A screenshot of a computerDescription automatically generated