Microsoft starts compiling final RTM versions of Windows 8

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Microsoft has not yet committed to a release date for Windows 8, but the company has started to compile final builds of the operating system. Listed as Release to Manufacturing (RTM), the builds start at 8500 internally and include the company's Aero removal that it is planning for the final copy of Windows 8. Microsoft revealed in late May that an RTM announcement was due within two months, and it appears that the company is on schedule.

http://www.theverge.com/2012/6/25/3116026/microsoft-compiling-windows-8-rtm-builds