Yahoo Mail used to be the market leader, but has since lost its luster. A year ago, Hotmail announced it had reached 360 million unique users per month, after 15 years. Google launched Gmail, as an invite-only service, in 2004.
Google has seen large growth in the past few months alone, moving from 350 million monthly active users in January to 425 million now.
comScore, however, had a different tale to tell, claiming Google is still in third. The analytics company claims Hotmail is in first with 325 million uniques, Yahoo in second with 298 million and Gmail in third at 289 million uniques.
The analytics company did note, however, that it did not include smartphone, tablet or Internet cafe usage.