The "low-rights" security feature being planned for Microsoft's upcoming Internet Explorer 7.0 makeover <A HREF="http://www.eweek.com/article2/0,1759,1826269,00.asp">will be available only in Longhorn.</A> "Low-rights IE" is a "defense-in-depth feature" meant to back up and support several security-related browser enhancements, but because it piggybacks on the "least privilege" feature being introduced in Longhorn, it won't be available for any other operating system, said Rob Franco, lead program manager for IE security at Microsoft.