Skype is down for many users across the globe since this morning. The last total blackout of Skype dates back to 2010 and it happened due to a technical issue. For the moment the reasons of today’s blackout are unknown. Some rumours say that it is a hacker attack and that Microsoft is working to resolve the issue. Skype support team has announced on its Twitter account that the Microsoft is aware of the problem and is working to resolve it. Still, at the moment it is impossible to make neither audio nor video calls.