What's the best / easiest way to combine two mailboxes on Exchange 2007?
Solution 1:
You can use the export-mailbox cmdlet to export your mailbox to a .PST file, and then the import-mailbox one to import the data in the target mailbox.
You can also use export-mailbox to directly move data from one mailbox to another, but then you'll need to save them in a subfolder of the target mailbox.