I'm working on sizing a server environment for our new exchange 2010 environment. We have roughly about 1000 people accessing our current 2003 server and expect that this will remain very flat on usage and growth.
In reading the docs for 2010 it looks like we need several servers to operate the new environment. Are any of the services able to be run on the same servers like the hub transport? If so, where would you recommend the these services be run?