Silicon Republic posted a story that similar to Apple's App Store policy, Microsoft is going to charge developers a 30pc fee for apps sold via its new Windows Store.

It has also emerged that tablet computers running on ARM processors won’t actually run x86 applications, or what are existing Windows 7 apps running on conventional PCs today, leaving the ground wide open for a new genre of developer to emerge.

However, existing Windows 7 users on x86 machines – pretty much most of today’s PCs – will in fact be able to use the new Metro layer as well as the new generation of apps when they upgrade to Windows 8.

  Windows 8: Microsoft to take 30pc cut for Metro apps