Yahoo! and Microsoft will host a conference call with Yahoo! CEO Carol Bartz and Microsoft CEO Steve Ballmer to discuss the agreement at 5:30 a.m. Pacific/8:30 a.m. Eastern Time today. ###>Yahoo! and Microsoft will host a conference call with Yahoo! CEO Carol Bartz and Microsoft CEO Steve Ballmer to discuss the agreement at 5:30 a.m. Pacific/8:30 a.m. Eastern Time today.