Windows Small Business Server 2008 is an all-in-one server solution designed to help you keep your data more secure and your company more productive. It provides many of the features used by larger companies, such as e-mail, Internet connectivity, internal Web sites, remote access, support for mobile devices, file and printer sharing, backup, and restore-all at one affordable price.
2008 gives you additional features in the Web portal remote console in addition to speed. Very stable, we use for several of our clients. If you do migrate from Windows 2003, make sure it does not have corruptions in the system otherwise be prepared to do a clean install and migrate the exchange mailboxes and data files only.