Tool to export users' mail to Exchange as a PST file or directly into inboxes

My company has been a Domino shop for the past five years. Six months ago, we were acquired by a larger company, which insists we move to MS Exchange 5.5. I am looking for a tool that will let me export my users' mail (as a whole, which include folders and whatnot) into either a PST file or directly into their inbox. Do you know of such a tool?
You could try Binary Tree or Microsoft. I don't know of any other way to do this. Of course, I spend far more time migrating companies from Exchange to Domino, not the other way around.


Editor's Note:
See also Utility to move Lotus Notes mailboxes to MS Exchange.

-- Dana

This was first published in July 2003