We have posted the Windows Server 2008 November 2007 CTP release for download through the Top Downloads section on http://technet.microsoft.com/subscriptions. Once you have downloaded it, you’ll need to access Subscriber Downloads & Product Keys to get the product key for installation.

To use the Top Downloads , you will need to install the Akamai Technologies Download Manager Browser add-on to access these files and will need to allow pop-ups (at least temporarily). 

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Windows Server 2008, Longhron, TechNet, CTP, Microsoft