Exchange Server (servers needed)

Below is a brief description of our Exchange and Network Environment. We want to look at making the Exchange Environment redundant. We currently have all roles on one server and want to provide redundancy for our users. Mail Data as well as access. I need some help at looking to find a tool that will allow me to help layout servers needed and quantity of roles.

We currently have 766 mailboxes
We currently have 8 Storage Groups/Mailbox Databases
We support many locations but all behind one router, our network is a MAN with fibers between sites
We support a single Domain
We are currently testing UM with 5 of the users
We want users to be in Cached Exchange Mode.
Current Server has Four Dual Core Xeon and 32 Gb of Ram
Mailbox data is on our SAN and will be moved shortly from SAS 15k drives to Fiber Channel drives shortly.
How many servers do we need?
We already have a SPAM device in place.
We currently support Web SSL from internet but not pop3 eetc.
timothydoerrAsked:
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JoWickermanConnect With a Mentor Commented:
Hi timothydoerr,

I'm running 5500 users on one Exchange server without any problems. We are however in the process of upgrading to Exchange 2007 with 4 backend servers and 2 frontend servers. Fortunately for us, budget allows it.

I hope this helps a bit.

Cheers.
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JoWickermanCommented:
Hi,

Are you satisfied with the solution? Can we close this post?

Cheers.
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