I just post this reply from that site and I copied it to here...
The day that Microsoft lost the "APP Store" war on PC was the date they declined Valve to make a platform for PC games which was around 2002. Microsoft was not the only company declined Valve approached for a client network (for games). The other 2 were Yahoo! and RealNetwork and we can see how these 3 are doing now... The only reason MS still standing unlike the other 2 because of MS Servers and Office. MS never had "long vision". MS had been in "catch up mode" for decades. I bought my first digital copy PC game from Steam. I bought my first digital copy of music and movie in PC from iTune (APPLE). How ridiculous MS rival Apple had an online store APP in MS Windows MUCH SOONER than MS?
In 2013, I was asking myself "why do I need to drive to Best Buy, lineup to buy a plastic box which contain a card with a key code for Office 2013, then drive back home, turn on computer, download Office 2013 installer and input key code from card to activate MS Office 2013?". This is so a$$ backward even in 2013!!
Microsoft is 300000% deserve to lost the WHOLE APP store market. Where can you find an APP store that require a particular version build of the latest build of OS - Windows Store. ALL Windows store's competitor can work on multiple versions of MS Windows. Don't forget some digital stores (Steam, Uplay..) support non-MS OSes (Linux, OSX) with the same account.
“I am not a Mac user unless under duress.” - John Carmack