The first one is a generic Get-Mailbox cmdlet and we also let PowerShell know that we are targeting all of the mailboxes on the system, so we tell it to give us an unlimited result size.

But the cmdlet is never listed as avilable in my admin account's shell nor does the export option in my exchange management snap in for each mailbox.

Moving Exchange mailboxes from one database to another is sometimes required to reduce the size of database, for migration, and other purposes. To move the mailboxes to another database, you can use ...