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Windows 7 was released to manufacturing on August 6th and to public on October 22nd and now it seems that Microsoft has started working on the first Service pack for Windows 7.
Similar to previous external beta service pack rollouts, Microsoft has enabled – via updates you already installed – a beta 'candidacy check' within its Windows Update software.
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Just like Windows Vista, a registry key and value pair need to be added prior to being authorized to download the new software.
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The external Windows 7 SP1 testing should commence soon, if it hasn't already.