It is interesting to document the quick growth rate for Dropbox. Consider this, back in November 2012 Dropbox had a total of 100 million users. It took them one year to reach the 200 million user mark last year. Compared to that it has taken only six months to cross the 300 million user mark now. The official Dropbox blogjust has a picture of door with the 100, 200, 300 million marks etched on the left side of the door frame. The blogpost is titled 'Thanks for helping us grow', with the caption 'New notch on the wall'.
For its phenomenal rise Dropbox seems mostly to have its Dropbox for Business service to thank. The shift towards a more business-focused approach has helped change the way it operates. It is to be noted that according to Forbes only around one percent of the users were paying for Dropbox's service whilst a majority of users were using it's free two gigabyte storage plan. Dropbox for Business has allowed users to maintain both personal and corporate accounts.
In addition, Dropbox recently even acquired several new companies, such as the 3D photo app Bubbli, workplace chat solutions provider Zulip, as well as personal photo-stream app Loom and collaborative document tool Hackpad.