List permissions a user has on shared mailboxes

Question

<#
.SYNOPSIS
Retrieves all permissions a mailbox has access to in the Organizational Unit 'domain/Accounts/Shared'.
.DESCRIPTION
This script will query all Mailbox permissions and Active Directory permissions a mailbox has on another mailbox.
Active Directory such as 'Send-As'.
.PARAMETER User
The Display Name, Email address, GUID, Alias.
.EXAMPLE
.\ListAllMailboxesAUserHasAccessTo -User 'JSmith'
This example will retrieve all mailboxes that Jsmith has full access to.
#>
param(
     [String]$User
Get-Mailbox -resultsize Unlimited -RecipientTypeDetails sharedmailbox  |Get-MailboxPermission |
Where-Object {($_.AccessRights -eq "FullAccess") -and ($_.User -like $User) -and ($_.IsInherited -eq $false) -and ($_.User -notlike 'NT Authority\Self')} |
Format-Table Identity -Verbose
This works only if I put user as "domain\userid. How can I just put the DN,Alias,UPN in the $user parameter?
Thanks,
Alexis
      

Answer 1

Hello Alexis,
Conver it to domain\userid on the fly if you put DN, Alias of upn...
$ConvertedUser = (get-mailbox $user).userprincipalname.split("@")[1].split(".")[0] + "\" + (get-mailbox $user).userprincipalname.split("@")[0]
Get-Mailbox -resultsize Unlimited -RecipientTypeDetails sharedmailbox  |Get-MailboxPermission | 
Where-Object {($_.AccessRights -eq "FullAccess") -and ($_.User -like $ConvertedUser) -and ($_.IsInherited
-eq $false) -and ($_.User -notlike 'NT Authority\Self')} |
Format-Table Identity -Verbose
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