The 15minute orbit of the SpaceshipOne experienced microgravity before it's decent back to earth.
Spaceship One actually did not achieve orbit. It merely followed a projectile path that would not have taken it around the earth. Since a projectile by definition is in free fall, Spaceship One experienced microgravity. An orbit is also freefall, but it specifically is a path that is wide enough to clear the object being orbitted.
Microgravity occurs any time you fall and reach terminal velocity.
Microgravity occurs any time you fall before reaching terminal velocity. It's dependent on your vessel's acceleration being close to the same rate gravity is trying to accelerate you at. As soon as that changes, some form of G-force will be experienced between you and the vessel. At terminal velocity, your vessel's acceleration will be 0g, while gravity pulls you at 1g, so there will be a 1g force between you and the vessel at terminal velocity. But I see the point you are trying to make, and there I agree with you.