The Microsoft Windows 8 App Store is adding around 500 apps each day, and already has about 20,000 apps available - a good chunk of which (about 87%) are free. Apple and Android currently have around 700,000 and 600,000 apps respectively, but Windows seems to be off to a good start - although I can't help but feel these sorts of numbers must purely be for bragging rights; surely a lot of those apps must be crap? Seven hundred thousand quality programs? I don't think so. Microsoft may struggle to reach it's stated intention of having 100,000 apps available within 90 days of launch, but it's chugging along.