BESR 2010 Server Edition have two license keys, one for a Server and one for a Desktop, so if you will purchase a Server Edition, though you need a license for a Desktop, it will still work, you just need to have the correct license key for activation.
But then again, I advise you to contact our Enterprise Sales Team ( 1-800-745-6054 opt 3 ) so that they can provide you further information on what would be the best edition of BESR 2010 you may use.
Hope this will help..Ü