calendar permissions query

I am trying to troubleshoot an issue with my calendar permissions. users can review all the fine detail of all my meetings/appointments, and I cant figure out where this has been set.

For example, reviewing the output of:  Get-MailboxFolderPermission

Shows the Default  group (presume this is everyone) only has AvailabilityOnly rights on my calendar. There is one other group who has reviewer rights, but other users not in this group are getting reviewer permissions over my calendar entries.

I also checked the output of: Get-MailboxPermission

Again none of these users are in any of these groups, yet can still review my calendar. I also checked in outlook "calendar permissions", and account settings > delegate access, and again none of these users are listed. Is there anywhere else this could be set? Its very strange.
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pma111Asked:
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Mark GalvinConnect With a Mentor Managing Director / Principal ConsultantCommented:
What permissions does 'Annoyomus' have? What about default Sharing Policys?
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FOXActive Directory/Exchange EngineerCommented:
use powershell to view the permission set on your calendar
In exchange management shell run the below

Get-MailboxFolderPermission -Identity youremailaddress:\calendar |fl
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FOXConnect With a Mentor Active Directory/Exchange EngineerCommented:
Run this on your calendar to restrict the default view for everyone

Set-MailboxFolderPermission -Identity youremailaddress:\Calender -user Default -AccessRights None
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pma111Author Commented:
like I mentioned though in my question, I had already run that command.

For example, reviewing the output of:  Get-MailboxFolderPermission

Shows the Default  group (presume this is everyone) only has AvailabilityOnly rights on my calendar. There is one other group who has reviewer rights, but other users not in this group are getting reviewer permissions over my calendar entries.
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pma111Author Commented:
Hi Mark,

Where exactly can you check what permissions anonymous has (is this going to be over the mailbox as a whole, or just over the calendar folder)? And where would I be able to identify the default sharing policies within exchange?
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Mark GalvinManaging Director / Principal ConsultantCommented:
Access the permissions by right clicking on the Calendar folder on Outlook (when showing everything as folders) and selection Properties. Then to Permissions and you should see it listed along with Default.
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pma111Author Commented:
Anonymous not even listed just default and 1 more group Id already been through the membership.
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