MAIL1.com -

Email, calendar and collaboration tools that your employees can access from any computer.

Uses your own domain name, we help set it up
Up to 100 users, we manage the accounts
High-powered email - Gmail with your own name & logo
Calendar and information sharing
Office documents, spreadsheets and presentations
Web pages, shared private sites, chat, individual start pages with gadgets, links and feeds

Up to 100 Users.
$25 per Month for the Whole Group.

Best of all, it's powered by Google, so there's no hardware or software to install or maintain.