We have resolved the incident and have resumed normal service.
Affected services: Calls to mobiles and landlines, Instant messaging, Skype-to-Skype calling
Affected products: Skype for Windows 10, Skype for Web, Skype for Windows desktop
Affected countries/regions: Africa, Australia / Pacific, Canada, Europe, India, Middle East, North America / Central America / Caribbean, South America, United Kingdom, U.S. Outlying Islands, United States