Dropbox boasts 400 million users but rivals are catching up

Dropbox made itself a household name by giving away cloud storage. The eight-year-old company, valued at $10 billion, had 300 million registered users a year ago; now it’s got 400 million. Its two-year-old effort to make money from business users has been less impressive. While Dropbox led the $904 million global market for business file-sharing last year with about a 24 percent share, No. 2 Box and No. 3 Microsoft each took about 21 percent and doubled their slice of the pie, growing almost twice as fast, according to researcher IDC.

Dropbox is hugely popular, but it seems clear they need to figure out this sales strategy quickly.