Apple released a beta version of Safari, which would become its standard Web browser built into the Mac operating system later that year. In June 2007, Apple released a version of Safari for Windows XP and Vista systems. Safari also is the browser used in Apple's iPhone. In June 2009, Apple released Safari 4 featuring speedier performance, enhanced integration with Windows and an at-a-glance view of a user's favorite Web sites. More than 11 million copies of Safari 4 were downloaded in the first three days of availability, Apple said. A niche player, Safari has less than 1 percent market share, Janco Associates says.