Most dreaded question: how many years of Microsoft experience do you have.

Pretty much all of them. I first used MS-DOS sometime in 1981, shortly after it was released. That’s 42 years of experience.

If professional office experience, then 31 years; the time, it do fly.

I assume this question means “Microsoft Office” or something as it’s too broad to really answer well, but I’ve used just about every major application MS has ever made and a whole lot of their minor ones too. Alas.