I am currently running Merak mail server by Icewarp on a windows server. It handles pop3 and smtp simply and the manual is very good.

We started out using outlook on each machine. When our ISP went out of business we found out that we were unable to communicate with each other internally. We installed Merak to solve that problem. What we found over time was that our IP was being blacklisted because we fit the profile of a spammer due to our setup. We were using a web collection server at the domain and collecting from one address but allowing our mail server to e-mail out directly. We have since changed this setup to send and receive through our ISP. We now only use the mail server to help filter spam. Having since moved away from outlook for *many* good reasons.

I don't why your company is installing a mail server but there may be better solutions depending on what you are wanting to accomplish.

Falcis