Windows 7: official release date is October 22nd

Microsoft has confirmed the release date of Windows 7, only 7 days since Windows Vista SP2 has been released. Windows 7 will be available to buy from October 22nd.
Microsoft has said that Windows 7 will come in five different editions: Starter, Home Premium, Professional, Enterprise and Ultimate.
Those who buy Windows Vista between now and its successor’s release date will likely qualify for a free or at the very least a discount on that upgrade, but Microsoft has yet to confirm details.
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