I dont think there is a difinitive lis as such. Both solutions basically
accomplish the same thing but are designed for different situations. EBS is
installed over 4 servers compared to the 1 or 2 over SBS. The benefit of
having 2 exchange servers and 2 DC's is redundancy and also faster times
processing user logon/authentication requests.
Fundamentally it comes down to the size of the organisation it is for:
http://www.reachformicrosoft.com/products_server_sbs.htmJames.
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James Yeomans, BSc, MCSE, MCITP