After ended service, Microsoft leaked beta 4 version on May 14, 2010. Release beta version for Longhorn and Whistler has ended service on June 14, 2010. In four day, on January 8, 2012. Microsoft reach end of service Whistler beta 3 update on January 14, 2012. In February 2012, Microsoft reach say the support for codename Whister has ended for support on February 7, 2013. Microsoft reach upgrade Whistler to Windows XP after end of support on April 2014.