“Microsoft has sold 40 million licenses of the Windows 8 OS since its launch a month ago.”
see Microsoft: 40 million Windows 8 licenses sold | ITworld.
OK, but who bought them? The OEMs? How long will they keep doing that if retailers cannot sell them except at fire-sale prices? OEMs are tired of being M$’s bagmen. This is the last straw. $billions are being tied up in inventory that no one wants.

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40 million of what is also important. This can include free upgrades to particular parties.
Windows 7 moved 60 million in first 2 months.
But by the end of windows 7 it drop to about 650,000 a day. Or about 20 million a month.
So it possible that Windows 7 did in fact sell at exactly the same rate as Windows 8. The second month is the key figure not the first. 60 million in 2 months would be flat market.
http://www.extremetech.com/computing/141676-windows-blue-microsofts-plan-to-release-new-windows-every-year
The start of the leak of information on Windows 9/Next/Blue.
Look like no more free service packs.