* In October 1997, Yahoo acquired Four11 and its web service mail was called Yahoo! Mail.<ref>[http://docs.yahoo.com/docs/pr/release123.html Yahoo! Media Relations]</ref> | * In October 1997, Yahoo acquired Four11 and its web service mail was called Yahoo! Mail.<ref>[http://docs.yahoo.com/docs/pr/release123.html Yahoo! Media Relations]</ref> |