Migration of Groupwise 5.5 to Exchange 2003

We are currently planning on migrating our current GroupWise 5.5 to Exchange 2003. What are some of our migration options? I would like if possible to setup a gateway service between Exchange 2003 and GroupWise 5.5 so the new Exchange server can take over sending and receiving internet email. Also we would be able to migrate a department at a time and still keep company email flowing. If this isn't possible what type of mailbox migration tools exist?
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What90Connect With a Mentor Commented:
Have a good look around this link. It should answer most of your questions:
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