harmony across OS providers will never happen and isn't necessary here. The cross OS file sharing has been solved many years ago and most successfully by 3rd pa

harmony across OS providers will never happen and isn't necessary here. The cross OS file sharing has been solved many years ago and most successfully by 3rd party independent tools like samba(intranet) or cvs/rsync(internet) and with HTTP based tools on the horizon (webdav is a good starting point). If my understanding correct, Dropbox is just extremely consumer friendly implementation of something like rsync. The main danger to them isn't OS providers, it is another Dropbox, more user friendly, agile, convenient, cheaper, faster ... while the original Dropbox grows and starts having cost structure and screwing up like a large company.