How long does it take to install Microsoft Office? Well, first you have to order it, and then you have to wait for it to arrive by mail, on a physical medium. Ever wondered why there is no app store on Windows?
Steve Ballmer explains it in an article on CNET: "nobody has any trouble getting apps"
I'm obviously nobody, so there must be another reason. Here is my best guess: An app store on Windows would be a target of regulation by authorities, and this would make it hard for Microsoft to design the app store in a way, that makes Microsoft applications the obvious choice for Windows users. Microsoft seems to take it for granted, that the alternative to getting an app on Windows, is to get the app on another PC that does not run Windows. For many Windows software vendors, it has always been the rule of thumb, that the user picks the application first, and the OS next - but...
as Ballmer puts it: "The whole Internet is designed basically for the Windows PC."
So, why is everyone excited about "app stores" like in Ubuntu, iPhone, Playstation, Android etc.? Ballmer explains it this way:
Ballmer: "...you need so many apps in a mobile app store is to remap Web sites that were written for the PC to look good on a mobile phone..."
Seen from a marketing point of view, there is no doubt that brands, that made it well on the web, like Facebook, are also good for marketing app stores. However, most of the apps that I downloaded from an app store, have either used the built-in GPS, used the built-in camera, improved the phones user interface, saved phone bill costs or interacted with other apps on the phone, like the contacts database. Nothing of this can be done from a web app.
Since Microsoft does not seem to be motivated for an app store, what about Google, Oracle/Sun and IBM? However, they do everything they can to make Windows substitutable, and do not have an interest in creating an app store for Windows. Sun was discussing a Java app store, but that doesn't really solve the problem. Creating an Open Source app store has 2 problems: Lack of accountability and lack of wide deployment. The app store needs to be very widely deployed in order to be attractive - you cannot ask people to download and install an app store, it needs to be there automatically, maybe as part of something else (like bundling with a browser).
There seems to be no reason to expect a Windows app store any time soon.