How to Expand the Recipient Scope in Exchange 2010/2013

You may find yourself in a situation where you have Exchange in a multi-domain environment, that when your running commands like get-mailbox it’s not displaying mailboxes across all the domains.

You can sort that out by simply expanding your recipient scope, you can do that by running the below

1. Open Exchange Management Console with Admin rights
2. Run the command below

Set-AdServerSettings -ViewEntireForest $true