$mailbox = Get-Mailbox -ResultSize Unlimited
$(Foreach ($Mbx in $mailbox){
Get-MailboxFolderPermission $Mbx.alias |
?{$_.FolderName -eq "Top of Information Store"} |
Select @{N="MailBox";E={$Mbx.alias}},FolderName,User,AccessRights,Identity
})| Export-Csv C:\MailboxFolderPermission.csv -NoTypeInformation
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Will.