Advanced server can support up to 8 processors and 8GB of ram. Server is 4 processors and 4GB RAM. Both have Terminal Server, a cool program that lets you login from somewhere else and use win 2k server to execute programs (kinda looks like PC Anywhere). Not much differences between the two except Advanced server is able to use more hardware. Really though, who of us in this forum could actually use more than a GB of ram? Seriously.