Well yes Gore technically ...although the system file structure\user profile environment did change in 2000....and XP is still very similar again.
Windows 7 file structure has changed from that ..I am still fairly new to windows 7...but so far love what I have seen separating the user admin permissions from the system admin is a good start......and the user profile structure has changed..

Currently shopping new server hardware \software ....2011 SBS...which I think is the 2008R2 version with all the bells and whistles.....which is W7 with server services ...

Are you nearly as confused as me??

MLF