Some of the biggest names in the Internet sector have called a détente in their rivalry and banded together to take on a common foe: America Online and its dominance of instant messaging technology. The coalition, IMUnified, includes Microsoft (MSFT: Research, Estimates), AT&T (T: Research, Estimates), Excite@Home, Yahoo! (YHOO: Research, Estimates), Prodigy (PRGY: Research, Estimates), Phone.com (PHCM: Research, Estimates), Odigo, Tribal Voice and iCast. The group's mission is provide instant messaging (IM) interoperability standards that will allow users to send messages to one another regardless of their IM provider.