Source -Only five months after launch, Windows 7 plays nice with an impressive number of applications. According to data from Microsoft, the latest version of Windows is fully compatible with almost 10,000 applications. Of course, these apps are just the software solutions featured in the Windows 7 Application Compatibility List for IT Professionals, a resource Microsoft updates constantly. In reality, as Steve Ballmer, Microsoft chief executive officer, indicated at CES 2010, there are in excess of 800,000 applications that will run on Windows 7. At the same time, the Redmond company revealed that there were over four million apps for all Windows platforms in total.
Windows 7 RTM Now at Almost 10,000 Compatible Applications - Featured in the Windows 7 Application Compatibility List for IT Professionals - Softpedia