Google said in June that it had 425 million unique users a month (an increase of 75 million from the number the company reported in January).
Google has reportedly claimed the top webmail spot based on its own internal numbers, but GigaOm has now shared some comScore data from October indicating that the third party now has Google ahead of Hotmail. In other words, we don't just have to take Google's word for it any longer.
Very cool to see Gmail take the global lead as top e-mail service: http://t.co/H4xqN6EM
GigaOm's Rani Molla shares this graph:
Interestingly Yahoo still dominates in the U.S., but for how long?