Yes. Why do you say that Vista didn't sell enough copies? AFAIK it sold about 330 million copies
http://seekingalpha.com/article/293424-microsoft-milestone-it-sold-450-million-copies-of-windows-7
Today, Microsoft (MSFT) has announced quite the milestone for Windows 7: since its launch in October 2009, a full 450 million licenses have been sold. The numbers are somehow more impressive when broken down; just a hair over 650,000 licenses are sold each day...
..
The company announced in its Q4 2008 revenue report that it sold 180 million Vista licenses since launch. At this point in Vista’s life (just over a year and half after launch), that averages out to about 335,195 licenses per day. Seems respectable without context, but after the same amount of time, Windows 7 nearly doubles that figure with 632,911 licenses/day.So, Vista released Nov 2006, 180 Million Vista
LICENSES as of Q4 2008 (2 years + 1 month), Win 7 introduced October, 2009, so did Vista sell another 150 million LICENSES between Dec 08 and Oct 09?? I doubt it!
http://en.wikipedia.org/wiki/Criticism_of_Windows_Vista#Sales_figure_inflation
Sales figure inflation
According to industry sources, as of late July 2008 Windows XP is still outselling Windows Vista, especially in business sales. According to HP, Microsoft is miscounting and inflating Windows Vista sales figures.[88][89] An HP manager is quoted in APC:
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"From the 30th of June [2008], we have no longer been able to ship a PC with a XP license", said Jane Bradburn, Market Development Manager, Commercial Notebooks for HP Australia.
"However, what we have been able to do with Microsoft is ship PCs with a Vista Business license but with XP pre-loaded. That is still the majority of business computers we are selling today."So the 330 million number is bogus, plus how many people have upgraded from Vista, which really was a POS, versus people KEEPING on XP, which was the best OS that MS ever made