MIGRATING sbs2k to exchange 2k

[Matt]

What would the method be to migrate 2k exchange 5.5 sbs to windows 2k and 2k exchange. 
Also appears there are only 20 users and the sbs server and 200 emailboxes. When we 
attempted migration from 2k server came back and said sbs should not be on originating 
server.
 
Thanks
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