Microsoft will ship Windows 7 to customers worldwide on Oct. 22, the company said Tuesday.
At the same time the company will offer an upgrade service called the Windows Upgrade Option to current Windows users, Microsoft said. More details about that program will be revealed during a keynote by Microsoft Corporate Vice President Steve Guggenheimer at Computex in Taipei Wednesday. The Windows Blog also discussed it today.
Microsoft previously said it would release both the consumer and business versions of Windows 7 in time for the year-end holiday shopping season. A release candidate of the OS already has been distributed through Microsoft's update service and has gotten generally positive reviews by users.
Windows 7 is the follow up to Windows Vista, which overall has been a disappointment for Microsoft and not very popular with business users or consumers.
Microsoft has said all versions of Windows 7 will run on PCs and notebooks as well as increasingly popular netbooks, which currently are running either Windows XP or Linux because Vista's hardware footprint was too big to run reliably on them.
October 22 
They need to take a look at Apple, and realise that Apple's OS's are a lot cheaper.. (although I guess they can do that, cos they know you need a mac to install it on)