Today, Microsoft has begun rolling out integrated Skype video calls in Outlook.com, bringing a feature first demonstrated last month to the public. The preview of Skype for Outlook.com is first coming to those in the United Kingdom, with users in the United States and Germany getting access in the coming weeks.
The Skype Blog details how the integration will work: you will be required to install a browser plugin - available for Internet Explorer, Firefox and Chrome - before linking up your Outlook.com and Skype accounts. Once your accounts are merged, Skype call buttons will be available whenever you mouse over a contact in an email thread or instant message; simply click to call and a window will pop-up for your Skype conversation.
While those in the UK can already access this feature right now, worldwide availability is slated for "this summer". It's just one of the products to emerge from the Microsoft purchase of Skype, as the features of Skype continue to be integrated across Microsoft services including Windows Phone 8 and potentially the next Xbox.
Source: Skype Blog