[Zer0]

I haven't tried it on 2003 server but you should be able to install Windows Media Connect or Tversity onto your 2003 server, either of these then just shares your videos/music folder with the 360.

It doesn't use a traditional network share but UPNP streaming but for all intents and purposes it works exactly the same for playing back your videos through the 360 dashboard. You can browse your folder structure, click the video you want and it plays and there is no need to have multiple boxes serving the same media.