Skype integrated into Outlook.com
Outlook.com, formerly Hotmail has been revamped over the last year and now users of this email service can now easily use Skype.
Also Microsoft closed down Windows Live Messenger in March this year in favour of Skype messaging and this latest development will mean all is in one place for users.
A plugin will be required to be able to do this.
More details can be found in this Skype blog post.