Merge branch 'master' into patch-1

Author: chrisda

exchange/exchange-ps/exchange/mailboxes/Add-MailboxPermission.md

@@ -15,7 +15,7 @@ monikerRange: "exchserver-ps-2010 || exchserver-ps-2013 || exchserver-ps-2016 ||
 ## SYNOPSIS
 This cmdlet is available in on-premises Exchange and in the cloud-based service. Some parameters and settings may be exclusive to one environment or the other.
 
-Use the Add-MailboxPermission cmdlet to add permissions to a mailbox.
+Use the Add-MailboxPermission cmdlet to add permissions to a mailbox or to an Exchange Server 2016, Exchange Server 2019, or Exchange Online mail user.
 
 For information about the parameter sets in the Syntax section below, see [Exchange cmdlet syntax](https://docs.microsoft.com/powershell/exchange/exchange-server/exchange-cmdlet-syntax).