(Telecompaper) Online storage service Dropbox announced that it's passed the milestone of 500 million registered users. Last summer it passed 400 million. Dropbox said new users are coming especially from outside its home market the US, in countries such as Brazil, India, the UK and Germany, as well as acquaintances of existing users, which accounts for 44 percent of new accounts. Dropbox's customers have created 3.3 billion connections to share content since the service launched in 2008. In the past year alone, the number of connections rose by 51 percent.