1. what is the speed of windows 2003 compared with XP
Its faster becasue it a Server OS, and it concetrate on Background services more than the running service, there looks faster...
2. what is the graphical interface like
Default interface is like windows xp with all graphics option turned off...
3. which one is more secure
Both... when u know how to make it secure, but in sense, they are made for different reason, u are not expected to run Server 2003 as a desktop OS...
4. can i operate it without using the server functionality in it? Cos dont plan to start a server
sure u can, but not recomended, u may face few problem with GUI as all defaulkt graphics, sound options are in default turned off, u have to put a lot of effort to turn those services back on again to run it like WIndows XP
5. is it light on memory usage than XP?
Once again, cant be answer like that, as i said it concetrate more on Back ground services as default, but when u customise to run the services to oparate as Widnows xp or rather DeskTop os, it will comsume more or less same memory as Windows XP..
6. r all programs compatible with it?
all most all of them are, exept Antivirus software, Firewalls, Internet Secirity type softwares...
Hope i am able to give what u need