Best practices for server services?
Anyone suggest a good best practices guide to the number of services to run on a server per number of users, per memory available? I've found plenty of "guides" and have read enough text books to know what the services do, but I want good solid numbers to use in laying out a network architecture.
I would like to say, "We have 200 users, which may grow to 400 in two years. This server can run Exchange, print services, etc. But past x employees, Exchange will need to be on its own server"..... etc etc.
Thanks for any links, or suggestions.