I see what you're saying, I just don't view it like that. There isn't any definitive way to say something is or isn't a product versus a proof of concept, my criterion included (it having customers).

Sure, maybe there are some really polished proofs of concept, and maybe there are absolutely horrendous products. Using your example of Outlook sending passwords, that doesn't suddenly mean it isn't a product and was reverted back to merely a POC. It's just a shit product.

Fortunately, it doesn't really matter. I just think folks shouldn't be so quick to shoot down one's accomplishments. Imagine seeing someone pursue their dreams and work on stuff they love, and the audiences reaction is "well, it's actually not a _real_ product." That's just lame.