Dropbox tops quarterly revenue, profit estimates on higher paying users

File sharing and storage company Dropbox Inc topped Wall Street expectations for first-quarter revenue and profit on Thursday, as it signed up more paying users and earned more revenue from them.Dropbox said it had 13.2 million paying subscribers at the end of three months on March 31, beating the average analyst estimate of 13 million, according to FactSet.The total paying subscribers included 100,000 users from electronic signature company HelloSign, which Dropbox acquired for $230 million ear