It is none of your business where he got his software. If you want to ask him what version he has because it affects the possible answers you gave him, like a feature not supported in one version that is another, that is fine.
That is the worst logic I've ever read. Why is one thing okay and the other not? By your definition, both pieces of information are none of my business. Why do I have the right to ask about one topic to affect the answers I give, but when it comes to the question about the legality of his software (which also affects the answers I give) I'm not allowed to ask because it's suddely not my business? That makes zero sense.
Don't answer him if you don't want to, but openly accusing someone of pirating software is just lame.
I agree, but because you skipped over the thread, you missed where I said people should be able to genuinely inquire. The key word is genuine. If I asked you if you had breakfast this morning I'm not necessarily accusing you of having breakfast. I'm asking you if you did or not. The same is true if I ask you about the legality of a program. I can ask because I really want to know- not because I think you're a pirate.