These are the most popular webmail providers from 2000 to now. Some of these webmail providers were around in the 90s but under different names, such as Rocketmail, which was purchased and rebranded by Yahoo in 1997. Others may be unknown in your market, such as QQ and Netease which are popular in China. When Google unveiled Gmail it forced many of the large webmail providers to innovate, such as Yahoo and Hotmail. Microsoft provided Hotmail and Outlook as separate services but eventually Hotmail users were moved over to Outlook service. The latest numbers come from Wikipedia.