If you need a very powerful email server and you don't need or want M$ Exchange, then use this. iMail has a fab web mail client, immense power and speed and the capability of using a shared ODBC User database along with my (IIS) web site and WS_FTP Server (made by the same company). I have a centralised User DB which uses my own DB table, with my own fields plus the fields iMail and WS_FTP require, giving me the flexibility of using a single login for all the services my server provides. The only gripe I have is it doesn't download mail via POP3, as it's been designed to capture email directly from MX records, but I use another free proggy, EmailRED to sort that problem out. So for flexibility, power, speed on NT, with Microsoft, use this!