Windows store now has over 100,000 Modern apps for Windows 8. Microsoft reached this milestone in roughly eight months after the release of Windows 8 in October. Steve Ballmer, the CEO of Microsoft anticipated a total of 100,000 apps in time for July and that figure has been achieved just in time.
Windows Phone Store took over 18 months to reach the 100,000 app milestone. The Apple App Store reached the 100,000 iPad-specific app milestone in around 14 months, and Android hit 100,000 after around 18 months.
Source: @Windevs