The Outlaw was a YT-1300 light freighter that may have participated in the effort to rescue Bothan spies shortly before the Battle of Endor. Just after the battle, the freighter was seen jumping out of the area. Scans would reveal that the ship was carrying spice.
Another YT-1300 light freighter named Outlaw participated in the Ambush of Rebel Alliance Frigate Rehz'nor, taking part in the resupply operation and withdrawing to hyperspace after firing all of its missiles at the attacking Galactic Empire fighters. Its cargo/passenger (possibly pilot) was only known as a "High Ranking Rebel Commander".
It is possible that these were the same ship.