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use powershell to view the permission set on your calendar<br />
In exchange management shell run the below<br />
<br />
Get-MailboxFolderPermissio<wbr />n -Identity youremailaddress:\calendar<wbr /> |fl
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like I mentioned though in my question, I had already run that command. <br />
<br />

<blockquote>
For example, reviewing the output of: &nbsp;Get-MailboxFolderPermissio<wbr />n <br />
<br />
Shows the Default &nbsp;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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Hi Mark,<br />
<br />
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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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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Anonymous not even listed just default and 1 more group Id already been through the membership.
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<div class="content wysiwyg-content">
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. <br />
<br />
For example, reviewing the output of: &nbsp;Get-MailboxFolderPermissio<wbr />n <br />
<br />
Shows the Default &nbsp;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. <br />
<br />
I also checked the output of: Get-MailboxPermission <br />
<br />
Again none of these users are in any of these groups, yet can still review my calendar. I also checked in outlook &quot;calendar permissions&quot;, and account settings &gt;&nbsp;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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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.

calendar permissions query

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.