4,500 is the number that Microsoft has put forward after the count of all Windows Vista certified drivers and
applications as of March 26, 2007. This number just seems small if you ask me, but it also has to be correlated with the 20 million Windows Vista licenses sold in the operating system's first month of commercial availability.
Windows Vista has managed to grow past Linux since January 30, 2007, but has failed to go past the 1% milestone of the operating system market, and in this regard, Mac OS X is quite a long way away. One of the issues that have been holding Windows Vista back is the lack of support and compatibility.
In an effort to get consumers to easily recognize products designed to integrate seamlessly with Windows Vista, Microsoft has unveiled the “Certified for Windows Vista” logo program. While counting in excess of 20 million sold Vista licenses, Microsoft also revealed that there are more than 4,500 certified for Windows Vista products to date and that over 2,500 of them have been added since January 30, 2007.
Microsoft Corporate Vice President of Windows Client Marketing Mike Sievert talked with Wall Street analysts during a Merrill Lynch conference and revealed that the customers’ perception of the support and compatibility issues associated with the operating system is not reflecting reality.
The Redmond Company also informed that it has stepped up the pace at which it is delivering drivers via Windows update, and that since the January 30, 2007 launch of Windows Vista it has served new drivers at the rate of 1,600 per month. This contributes to increasing the total number of Windows Vista drivers at over 27,000.
Source:softpediaMicrosoft, Windows Vista, Certifited, Software Drivers, Applications