iCloud: Sharing done wrong: Looking at iCloud in particular, it seems that Apple's approach to sharing is almost antithetical to the concept itself. The online service rigidly defines what you can share and how you can share it; its primary directive often seems to be to keep you inside Apple’s ecosystem.
Indeed, Apple’s idea of making all of your files accessible to you from anywhere through iCloud overlooks two specific user needs: Sometimes you want to open files in multiple programs, and sometimes more than one person needs access to a file.