How do I view the permissions on a Exchange 2010 Mailbox?

I have been requested to provide a list of who has access to what users Mailboxes in Exchange 2010.  I ran the following powershell command against one of the users mailboxes but I know for a fact it didn't return the correct information.  I know this user shared his mailbox using the Outlook 2010 gui but it didn't show up in the results.  How do I gather this information for everyone?

Command I ran:
Get-mailboxpermission -identity username | format-list
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bullfrog264Asked:
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AkhaterConnect With a Mentor Commented:
if you want the delegates check http://www.ericwoodford.com/book/export/html/168


Powershell - Enumerate Delegate Rights for a mailbox
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AkhaterConnect With a Mentor Commented:
if you are looking for full access permissions it would be

Get-Mailbox ak | Get-ADPermission
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AkhaterCommented:
of course replace the "ak" by the username
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bullfrog264Author Commented:
This still didn't show the users Mailbox permissions they delegated through outlook.  I had to run a get-mailboxfolderpermissions cmdlet as well.  I noticed that even with this it didn't show any subfolders under the main Mailbox folder either.  Is there anyway to get a comprehensive look into each mailbox short of clicking on each folder using the UI in outlook?
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Malli BoppeConnect With a Mentor Commented:
if you have auditing enabled
Get-Mailbox username | fl *audit*

or use CSVDE and check the follwoing fields publicdelegate and publicdelegatebl
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bullfrog264Author Commented:
I ended up having to do a combination of the solutions suggested.  I gathered mailbox permissions, ad permissions, and then delegates.  The combined lists gave me a good idea of who had access to each others mailboxes.
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