External Pop3/SMTP server migration to Internal Exchange 2003 server

We're currently planning a move from an outsourced web hosted POP3/SMTP mail solution to MS Exchange hosted internally (all with our own domain name), and would appreciate some advice on things we should be aware of in the transition.

Our current environment is a head office in one state, and 3 other satellite offices, which are connected by constant VPN. The exchange server will be located in the head office. All satellite office users have a local PST file in outlook which would also preferably me migrated in, however note some are 4-5 GB!

Does anyone have a best practice migration plan or resources for same that can help us avoid the pitfalls and hidden traps that I will probably forget?
aarombawaAsked:
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