I've read the MS document on how to do this, as listed in
many replies to this class of question. However, I don't
see a method to do this whereby you do not need to
remove/join domain on clients. My Client has 50 pcs, and I
don't want to remove/join, as well as setup the users
profiles on PCs. MY Client has software installed that
requires special settings for the users. Creating a new
Domain SID would mean that each user gets a new profile on
their workstation. This would cause me to have to perform
many steps on each PC after moving to SBS2000.

I thought that perhaps the following would work:
1) Install Win2K Server as DC on existing domain.
2) Remove SBS 4.5 from network.
3) Install SBS2000 on Win2K server box to keep AD info.

or
1) Remove SBS4.5 from network.
2) Install SBS2000 on new server.
3) Use AD Migration tool to migrate data from existing NT BDC.

Any assitance would be greatly appreciated. Again, my goal
is to keep the domain SID while moving to a new server.

Thanks
Sean Trimm