You know this has to be keeping Bill up at night. I mean, he paid hundreds of millions of dollars for HotMail back in the day. My GMail account is up to 200MB. How fat is yours?

Between 52 to 56 percent of customers switching to Gmail came from a Hotmail address each month, said Return Path. This compares to only 24 to 34 percent being from a Yahoo account. The rest of Return Path’s clients were switching from MSN, AOL and Comcast, though at much smaller numbers.

(Via BetaNews.)