It is now the third largest Web mail service in the U.S. In July, Gmail nudged past AOL Email with 37 million unique visitors compared to 36.4 million for AOL, according to comScore estimates. That puts Gmail within sight of the No. 2 player, Windows Live Hotmail, which has 47 million unique visitors. After that there is a wide gulf separating Yahoo Mail and its 106 million monthly unique visitors.

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