> No, that wouldn't happen. Lots of people don't have email through Google, for one.

Based on some data I collected around five years ago, roughly 80% of US customers used GMail for personal email. It was overwhelmingly the most common choice. I suspect that number has only drifted upwards since.

(What about the rest? 15% were using Yahoo; the rest were spread thinly across AOL, Microsoft, ISPs, and colleges.)