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