Windows Live does SMB Email---For Free

"Microsoft has kicked its Windows Live webmail service up a notch. Head on over to the Custom Domains beta site, and the company allows you not only to sign up for Webmail, but to do so with your own domain. Buy a domain or grab an existing one and you can point its MX records at Windows Live infrastructure. From then on, Windows Live is your email server, with a fully enabled webmail platform that'll include up to 20 accounts, each with 250MB of mailbox space, spam filtering, virus scanning, etc." Source: infoworld.com