"As of today, we've found no intrusions into our internal systems and no unauthorized activity in Dropbox accounts," said the , posted early Friday morning.

The cloud storage company to look into complaints that users were receiving spam at email addresses they used solely for Dropbox. Several users receiving the same spam messages, spurring fears that the spammers had obtained their email addresses through Dropbox.

Because users sometimes store personal and professional data with cloud storage services like Dropbox, security is a serious issue.

"We've reached out to users who've reported receiving spam messages and are closely investigating those reports. Security is our top priority and we'll let you know if we uncover evidence that these email addresses came from Dropbox," a Dropbox staffer wrote.

Users on the forum indicated that they hadn't received any further spam on Friday, and several users appeared comforted by the update.