Skype calling on Outlook.com available for North America and UK users
Great news for Outlook.com and Skype users in the United States, Canada, United Kingdom, Germany, Brazil, and France: you now have the ability to make Skype video calls from Outlook. Your Skype contacts are going to appear grouped within your Outlook contact list. You just need to install a plugin before you can video call someone. The browsers supported include Internet Explorer, Chrome, and Firefox.
Source: Outlook Blog