( CNN ) -- Dropbox , the popular cloud-storage service , is investigating whether a security breach is to blame for a recent wave of spam e-mail sent to users . The company is investigating internally and has brought in an outside team of experts `` to make sure we leave no stone unturned , '' according to a post from an employee on the Dropbox forums . `` While we have n't had any reports of unauthorized activity on Dropbox accounts , we 've taken a number of precautionary steps and continue to work around the clock to make sure your information is safe , '' the post says . On Monday , users of the forums had begun complaining about receiving a flood of spam in their e-mail . Some of them said the e-mail address impacted is one they have only used to create their Dropbox account . Many of the users who complained are from Europe and at least some of the spam messages are scams masquerading as messages from European gambling sites . Many users also had wondered whether an hour-long outage Tuesday was related to the problem . But in the forum post , Dropbox said the outage `` was incidental and not caused by any external factor or third party . '' It has been just over a year since a glitch briefly let people use any password they wanted to sign into any Dropbox user 's account . The company said that problem , which lasted for about four hours , was caused by errors in a code update . Dropbox has roughly 50 million users who , according to the site , upload a billion files to the service every 48 hours . The company has emerged as a leader in the emerging field of cloud , or Web-based storage . The cloud is designed to save hard-drive storage space for users by instead letting them store and retrieve documents to multiple devices from remote Web servers . That kind of remote storage is being viewed as the future of computing by companies like Apple , Google and Amazon , all of whom offer cloud-storage features . But it has raised the obvious concerns among some security analysts , who say remotely stored info could become a tempting target for hackers .
Dropbox is investigating spam attacks on users . File-storage company has brought in outside team to investigate . Score: 7 There have been no reports of unauthorized activity on Dropbox .