Currently we have 4 different sites with around 200 employees at each site. All our servers and Internet is hosted at a Data Center. We are planning on upgrading our DC's and Exchange servers at our Data Center and could use a little guidance on what the best practice would be. If someone could give us a few scenarios on what the best practice would be we would really appreciate it.
We will be installing 2 new DC’s and 2 or 3 new mail servers.
How many servers for exchange 2 or 3?
What roles to assign each server?
We want to use DAG.
Will a barracuda for spam be recommended or should we do Microsoft forefront protection?