Dropbox calls claim of hack attack "a hoax" after internal update shuts down the site
Emails that allegedly were stolen from Dropbox, showed up elsewhere on the web proving that hackers did not break into the company's secure servers. Besides taking responsibility for the downtime at Dropbox, @AninOpsKorea also claimed to compromise the Dropbox website, while @1775Sec tweeted that it was responsible for stealing email addresses and posting them at pastebin.com.
Again, Dropbox says that this is all a hoax. If there is one thing that a cloud based storage service can't afford to have, it is a question on the part of the public as to how secure their data is.
source: pastebin.com, Dropbox via TechCrunch