Microsoft has announced the General Availability (GA) of Windows 8 at the annual sales meeting. Windows 8 will be available to customers on October 26th 2012. Tami Reller, while speaking at Microsoft Worldwide Partner Conference, earlier this month had told attendees Windows 8 would be available in October, but no specific dates were given.
Customers will be able to get Windows 8, both in upgrade form as well as for new PCs. So if you are using Windows 7, Vista or XP, you can upgrade to Windows 8.