Windows 7 vs Vista

A study by Janco Associates conducted .According to the reports of the study Windows 7 hold 14.6% of market share in the professional segment against 12.8% in Vista.
We already know that Windows 7 was largely successful entry , with 90 million copies since launch in October. Janco Associates, a consulting firm in management information systems,  learned that Windows Vista has exceeded seven companies.Within nine months of their release, the increase was even more bitter for Vista, with only 6% market share according to Janco Partners, against 14% for  windows 7 today. Please keep in mind that Janco Partners study  is based on  RTM version of Windows 7 (available in August) and not leaving “official” last October, which explains the nine months already reached.

The new OS already would total 14.6% market share against 12.8% in Vista, which has been a real flop in the company and contributed to the unusual longevity of Windows XP .

However, the figures Janco differ markedly from those of other analysts. NetApplications gives 11.6% of market share to Windows 7, 15.6% and 63.4% to Vista to XP. StatCounter is more generous for Windows 7 (14.5%) and Vista (20.5%), and more conservative for XP (57.1%).
But their statistics do not focus, like Janco, solely on the professional sector. The wisest of all is that Microsoft believes that Windows 7 has 10% market share.