you can definitely reload the os and then install BES, but you have to backup the current db, then reinstall the current version of BES once you are done with the os. then restore the db files and then upgrade to 4.1.5. when you are installing BES it will ask you for the SRK and license keys. If you restore the old db files to the new server then you dont't have to reactivate the users.
if you don't want to resintall the os, just uninstall exchange, but make sure to have system manager installed oin the BES.
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BES 4.1.5
Exchange 2003 SP1
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