How to see GUID of new user mail box

Hi Member

How to see GUID of user mailbox on the web ECP ?

Now when i need to GUID must run Power shell as below

$username = "username"
$guid = (Get-Mailbox $username).ExchangeGUID
$upn = (Get-User $username).UserPrincipalName
$upnsuffix = $upn.Split("@")[1] 
$ServerName = "$guid@$upnsuffix"
write-host $ServerName