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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?
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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Hi，
Based on my experience, you could refer to the followings:
I've checked the Get-MailboxFolderPermission -Identity user@domain.com:\calendar in PowerShell and the user who can see the calendar is not listed in there. I also checked local AD just now for any settings present in the Attribute Editor for the affected user, so far nothing. I already confirmed their local Outlook has no share permissions set for sharing their calendar to anyone at all.
Hi，
I'm glad to have your reply. Because you have checked the permissions of the user in question, but no exception was found. We recommend adding permissions to users first, and then removing permissions.
This process is a bit complicated, you can try it by modifying a user.
Hello, it's been a long time since I've heard from you, did my previous reply help you, if it was useful, you can mark it as an answer. Thank you for your understanding and support.