Windows 7's release year was 2009, with staggered release dates for different audiences. The operating system was released less than two years after its predecessor, Windows Vista.
The release date for the versions of Windows 7 available to the public was October 2009. Available versions for manufacturers released during the summer of the same year. Windows 7 Home Premium, Professional and Ultimate released simultaneously. Other versions of Windows 7 not available for retail, including Windows Starter edition, became available to manufacturers at the same time.
The announcement regarding Service Pack 1 for Windows 7 happened in March the following year, and the beta version released in July. The final product was not available to the general public until February 2011. Platform Update for Windows SP1 released in 2013, after its pre-release software was well-received in late 2012. This last released update for Windows 7 was available in October 2013.