While the large anti-virus vendors continue to spend millions of dollars and thousands of man-hours churning out updated signature files, a Utah-based startup this week plans to unveil <A HREF="http://www.eweek.com/article2/0,1759,1665212,00.asp">an entirely new email security solution</A> that needs no signatures and is capable of trapping malicious messages before they reach users' desktops. Avinti's iSolation Server takes a unique approach to the challenge of stopping virus-infected messages and other malicious email from reaching desktops. The solution relies on virtual machine technology to tell which messages should be blocked and which can be safely forwarded.