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Microsoft made a huge bet that Windows 7 would not only erase the stigma associated with Windows Vista, but also help its own flagging revenues by impelling a massive tech refresh on the part of businesses and consumers. In the months since the operating system’s October 2009 release, much of that bet seems to have paid off; although business IT spending remains anemic following a global recession, Microsoft claims that some 90 million Windows 7 licenses have been sold.