Just FYI, 2003 support sunsets on 14 July of this year. That means no more support, extended or otherwise, and no more updates. 2003 will be as vulnerable as XP at that time. You might want to consider upgrading.
Yep, Server 2003 was basically XP-Server. That was a great build, IMO.
The only good news about remaining 2003 installations is they probably aren't used much to visit pr0n sites, so their likelihood of encountering malware isn't as great as the average XP box.
Probably, mind you... just probably... :)