 Dropbox has seen steady user growth since its inception.It surpassed the 1 million registered users milestone in April 2009, followed by 2 million in September, and 3 million in November.It passed 50 million users in October 2011, 100 million in November 2012, 200 million in November 2013, 400 million in June 2015, and 500 million in March 2016.