Just wondering.

http://fallout.wikia.com/wiki/Vault_0

From what I understand, Bethesda sees all major events in FOT as canon. I would consider Vault 0 pretty major, so my guess would be that it is canon to an extent. They really need fo4 to follow up the story of FOT to clear up questions like this once and for all.

They'll probably retcon it so that it makes more sense.

Yes it's canon according to Bethesda, " high level events are canon " thing. Considering it's the pinnacle of Tactics I'll assume it is.

As others have said. "High Level Events" are canon so says Bethesda.

Vault Zero and the Calculator are the highest level event in Fallout Tactics, therefore it is canon.

All Bethesda has to do is in a future game, explain Vault Zero's Role.

Vault Zero's Role as explained in Fallout Tactics was to the nucleus of the Vault Network. Alot of important people were sent there.

Now the problem some people have is "Well the Enclave Oil Rig was the nucleus of the Vaults. It is where the Vault experiments were monitored from."

The Vaults in Secret were used by the Enclave for their secret social experiments and they were the only ones that knew about the Enclave Oil Rig and the Vault experiments. On paper and as sold to the American people, the Vaults were all meant to save people. People would go in, ride out the nuclear war or other event in safety and come out and start over. They would have never gone along with the Vault experiments, they did not know about them because they were super secret Enclave plan.

Vault Zero was built because the Vaults would need a place to connect all the vaults to orchestrate the rebuilding. The American people had to see that their money was going to good use and that the Vaults would work together. Vault Zero was the public face for the Vaults. The grand show piece.

Enclave could not stop it from being built because logically the Vaults would need a nucleus, a place or orchestrate the Vaults. Other none Enclave people in the Government commissioned Vault Zero. The Enclave did not see a need for it. So they were the ones behind the many budget cutbacks which was the reason many of the Vaults backup systems were never installed. Which caused Vault Zero to fail and kill many of the none Enlave members of Government housed there. Money that was meant for Vault Zero was then embezzled by the Enclave and spent on their top secret Enclave plans, like the Enclave Oil Rig

That makes sense and it is all Bethesda has to say in a Future Fallout game. Bethesda's only real problem with Tactics is how things look. That can always be changed, seeing as how they changed the way things looked from the Originals, when they made Fallout 3.

Another problem people have is that the Location of Vault Zero was to the "The Crater" In Van Buren. A game that was never made and therefore not canon.

Vault Zero was given a small army of robots to help in the rebuilding and pacification of the wasteland. The army got bigger in Fallout Tactics because the Calulator was able to make more robots.

The New Vegas DLC Old World Blues shows Computer/Brain connections and so does Fallout Tactics with the Calculator, so it isn't that far-fetched.

I'm pretty sure all the official content involving Fallout is canon.

So, I think Vault 0 is canon. The same way I say Mothership Zeta is canon.