Outage leaves Skype users in the cold for the second time in as many weeks.
Popular VoIP app Skype has suffered its second widespread crash since it was officially purchased by Microsoft last month.
The outage swept through the network at about 11:30 BST, causing the app to consistently crash on Windows as well as Mac OS X and the wide range of smartphone applications. At the time of writing, the service is still down.
The ill-timed crash will have Skype engineers rushing to find the second fix in as many weeks, after a small software update appeared to have solved a very similar problem.
Microsoft must now be wondering whether the $8.5 billion it shelled out in cold hard cash, was perhaps a buck or two too much. And, with Apple announcing its rival iMessage service for iOS 5 yesterday, this outage leaves Skype looking exposed.
Skype posted a message to followers on its Twitter account just over an hour ago, admitting that users were having problems signing in.
The post read: "A small number of you may have problems signing in to Skype. We’re investigating the cause, and hope to have more details to share soon."
UPDATE: Skype says it has identified a "configuration problem" and that affected users should see an improvement in the next hour or so.