Microsoft's Windows Store now boasts a library of 20,000 apps, according to a Twitter post by tracker site Win App Update. The number reflects a global estimate, as few apps are available in all regions. The online marketplace has a grand tally of 20,610 apps worldwide, with 87 per cent, or 17,958, of those being free to download. Most apps are region-specific, due to factors pertaining to licensing, language and cultural relevance. The UK currently has access to...