Cmdlet to get Mailbox Permission "Manage Full Access Permission"

Hi ,

We are trying to find out the users/ groups having “Manage Full Access Permission” on particular user mailbox.

We are using below cmdlet

 Get-Mailbox “xyz@domain.com” | Get-MailboxPermission | where {$_.user.tostring() -ne "NT AUTHORITY\SELF" -and $_.IsInherited -eq $false -and $_.Deny -eq $false} | Select User

Now we were getting correct result for some users and some users we are not.

We are comparing this command results with Exchange Management console UI i.e. we right click on user mailbox and select “Manage Full Access Permission” menu but our command results are not matching with the UI.

Can some body suggest a command which will match the results as per the EMC UI?

Regards,

Abhagwat