Update Disable-Mailbox.md

Author: dariomws

exchange/exchange-ps/exchange/Disable-Mailbox.md

@@ -283,7 +283,9 @@ This parameter is available only in the cloud-based service.
 
 The PermanentlyDisable switch specifies whether to permanently disable the mailbox. You don't need to specify a value with this switch.
 
-You can only use this switch on user mailboxes that aren't licensed and aren't on hold.
+Notes:
+- You can only use this switch on user mailboxes that aren't licensed and aren't on hold.
+- When the Exchange Online license is removed from a mailbox without following other deprovisioning steps, this may leave the mailbox in a hard-deleted state. In this case, this parameter is not useful. You can use it, for example, in hybrid Exchange environments.
 
 ```yaml
 Type: SwitchParameter