The Evernote note-taking service, which boasts 100 million users worldwide, has confirmed it today fell victim to a distributed denial of service (DDoS) attack which disrupted services for several hours.
The company took to Twitter this morning to advise its customers the service had been rendered unavailable.
It said it was actively working to neutralise a denial of service attack, with services disrupted while the company attempted to resolve the issue.
Several hours later it informed customers the service was back up and running, but warned users to expect hiccups over the next two days due to lingering issues.
"We appreciate your patience," the company said on Twitter.
Ronda Scott, a spokeswoman for Evernote assured iTnews "as is the nature of these sorts of events, no accounts were compromised and no data was lost".
The news comes just over one year after the application was hacked, and its customers' usernames, email addresses and encrypted passwords stolen.
Evernote was forced to reset the passwords of its then 50 million users. It denied that financial details were accessed.