At the moment each OS vendor is pushing their own cloud solution (Azure, iCloud, Kindle Amazon cloud storage) Dropbox could become the universal cloud storage,

At the moment each OS vendor is pushing their own cloud solution (Azure, iCloud, Kindle Amazon cloud storage) Dropbox could become the universal cloud storage, which can be accessed using identical APIs on every platform, thus becoming the single store for users working with multiple operating systems. Furthermore, application programmers will only have to target this one API.