[Bush2000]

I could suggest a number of them...

Name them. I could use a good laugh.

... but the point wasn't an OS that didn't have holes, it was paying a monthly fee to be protected by the same company who made the mistakes in the first place.

When you can point out any publicly available OS that doesn't have any holes, I'll agree. But until then, I'll just have to laugh in your general direction.

[ShadowAce]

Name them. I could use a good laugh.

Hmmm. I haven't heard of or found one in MVS. CPM comes to mind as well. DOS (<=6.22), since it's pretty much a single-user OS.

I assume there are others, but they are probably useless as real OSes. :)

No, I'm not saying MVS is useless--I'm saying the other OSes I can't think of probably are