
To my knowledge (and I may be wrong...things change) MS doesn't support
restoring to different hardware. They seem to view disaster recovery and
hardware migration as two separate issues.
In the rare circumstances where I've had to do this, I've found the best
solution is to do the following:
1) Restore the system-state (which will include your AD) to a virtual server
running Win2k3. The barebones Virtual Serer drivers rarely cause problems
that surface when trying to restore system state to a 'real' server.
2) Follow the 'adding SBS to an existing domain' document to add your new
PowerEdge 2900 to the virtual server's domain. That'll get your AD
structure onto a clean machine without the cruft from the rest of the system
state.
3) Finish restoring the other items (sharepoint, email) to the new server.
Since the old server is apparently no longer functional, the usual
suggestion of a swing migration is, unfortunately, probably not going to
work well. You could install SBS to a virtual server, restore everything,
and then do a swing migration, but I feel like that'd be moving a lot more
data and could actually intrudce more complexity than what you
need...considering the situation. Others may feel differently.
-Cliff
Two documents that'll help
http://www.microsoft.com/smallbusiness/support/articles/backup_restore_sbs2003.mspx
http://support.microsoft.com/kb/884453