configuring pre-4.0 Blackberries to BES

Yesterday, I was setting up a Blackberry 7290 to use the BES box I had created.  The BB was running version 3.8 of the device software so it couldn't use over the air enterprise activation.  After searching, it was just as simple as reinstalling the the BB desktop software and when prompted during the install - tell it to use a BES/corporate server.  I had already created a user on BES for the user who was on this BB - but I don't know how necessary that was.  It seemed pretty easy upon that install, which was nice.