There is no 1 book that you can have to learn 2k server. There are all the different networking services such as DNS and WINS that have different applications and features than UNIX DNS. You also have certificate services, rras, terminal server, all sorts of other services. On top of that you have Active Directory to learn and its many uses and ability for other services to integrate with it. This is all assuming that you know how to use win2k in general. The Microsoft win2k server resource kit is 7 books long i think. You may want to check it out, or just go buy seperate books, win2k network infrastructure, active directory administration, and win2k server/pro general adminstration.