Has Brett Favre ever beaten the Cowboys? I've got money on this one but really can't remember if he has.?

He has but he didn't get off to a good start with them. In three consecutive seasons he lost to the cowboys in the playoffs. That was early in his career and it was against the dynamic Cowboys team of the 90's. On November 4, 2007, after the Packers defeated the Kansas City Chiefs 33–22, Favre became only the 3rd quarterback to have defeated all thirty-one other current NFL teams. He joined Peyton Manning and Tom Brady as the only quarterbacks in NFL history to do this, just the week after the two of them achieved the accomplishment.[49] On Thanksgiving 2007, Favre led the Packers to a 37–26 win over the Lions, and brought Packers to a 10–1 record.