Nai Fohl
Advocatus Diaboli
Moah...some people here realy get me angry with their wild assumptions. I actualy would like some pumpgun to hunt down some noobs here.
Seriously...
A)
Form VII is not "completed" in the times of the PT. There is still a working process on it. Form VII is called Juyo and is basically a blend of form IV (Ataru) movements, form II (Makashi) precission and form V (Djem So) powerful strikes. If you want to see a "normal" form VII praticioner take a look at Darth Maul.
Mace created his own form (Vaapad) out of form VII. It more relies on precise and fast hits with less powerful strikes and faster movements. Also he added the ability to channel dark side feelings and make them a weapon for the light side and he included his unique Shatterpoint ability.
B)
In Tulak Hords time the lightsabers were pretty new to the Sith. Their first contact with it was during the times of the Great Hyperspace War (5,000 years before ANH). The Sith Lords before used blades enchanted with Sith magic (Ragnos, Sadow). So Tulak Hord was around somewhere in the times between the Great Hyperspace War and the events in KOTOR I (3,956 years before ANH).
If he used ANY known form or something that got close to one of the known forms it's form II. Form II is the lightsaber duel form and nearly all great lightsaber duelist known used it. Tulak Hord wouldn't have used a form that is still in development 4,000 years past his time.
C)
Hell...Tulak Hord would waste ANYBODY else in terms of sheer lightsaber combat (except Yoda maybe) so Mace pretty much dies in that fight as I don't give him a chance against somebody that is an ancient Sith Lord and the best Sith swordsman ever.
D)
One last point: Lightsabers and normal sabers are not combareable. A normal saber has a blade that - at least - posesses 50 % of the entire sabers weight. Now...a lightsaber "blade" has a weight of 0. You simply can't use the same forms with a saber that you can use with a lightsaber because something that makes wield a blade made out of light (with no weight) will pretty much kill you if you try to do the same with a "normal" saber and vice versa.
That's the reason why people who aren't familar with a lightsaber would pretty likely hurt themselves with that weapon while most people can handle a normal saber without injuring theirselves.