>My Mom, the sweetest, most morally honest lady in the world (ok, I'm biased), didn't give a thought to using the same copy of Windows and Office on both her home and office machines, until I pointed out to her that it's illegal. In fact, _most_ of the people I know don't give a second thought to it, usually because they never even thought about it being illegal.

I don't see the problem since she's the only one using it, and she isn't using both copies "at the same time". If she had the two "connected", it might be a different story.

To me it's one of those "common sense" scenarios. "Technically" she would be in compliance, if she copied back and forth, and erased the copy she copied from. I don't think the courts would make a lot of hay about the fact that she skipped the "erase step". Taken to an extreme, if one of her machines failed and she reinstalled on another, on could maintain she was in violation because her "dead" machine had a copy on it .... or her "cycle" of system backup tapes constituted more than "copy" ... etc.

What she's doing is "fair use", IMO ... and the particulars of a license don't negate that.