upgrade exchange 5.5 from SBS 4.5 to 2003 regular server

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    I have one SBS 4.5 with Exchange 5.5 on and AD.
    I want to remove the exchange 5.5 from the SBS
    (I can even format the SBS server at the end of the project) and
    Upgrade the Exchange 5.5 to Exchange 2003 (on a different and regular 2003 server).
    At the end of the project, I need the have Exchange 2003 on a regular 2003 server.

    1. What is the best way to do so?

    2. Is it possible to join a second exchange server (2003) to the exchange (5.5) in a SBS 4.5 environment, and then simply move mailboxes?
    Could this work?
    Would I need to upgrade the s SBS 4.5 to SBS 2003 first? Will I need special Licenses

    3. My original thought was:
    install the EX 2003 on a different (and separate) server,
    then exporting every mailbox (manually by .pst or by EXMERGE) to the new server.
    The problems with that way are:
    it’s slow, it’s offline, it will bake the old connection (like meeting at the calendar).


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