Microsoft's Windows 7 RC was made available to the public for download in May and the cut-off date was eventually pinned to August 20 - at about 4pm BST.
For those that have a copy of the RC on disc but have not yet obtained a key to use it, Microsoft has suggested that they will still be offering this service.
Those who have grabbed a version will be able to use it fully until March 1, 2010 when the system will shut down every two hours until June 10 when it will not boot – with the full retail Windows release date October 22.
The decision to release the RC to the public was a brave one by Microsoft, but it has been ratified by the wealth of positive feedback about the successor to Vista.
TechRadar's Microsoft expert Mary Branscombe gave the operating system five stars in our extensive Windows 7 review, suggesting that the OS was 'the best version of Windows yet'.
Pre-sales of the Operating System left Microsoft 'overwhelmed' and the company is now looking forward to the full release in October.
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Patrick Goss is the ex-Editor in Chief of TechRadar. Patrick was a passionate and experienced journalist, and he has been lucky enough to work on some of the finest online properties on the planet, building audiences everywhere and establishing himself at the forefront of digital content. After a long stint as the boss at TechRadar, Patrick has now moved on to a role with Apple, where he is the Managing Editor for the App Store in the UK.