This video demonstrates the features of Lync, SkyDrive and Office Mobile which are all available directly on your Windows Phone. You can access and work on your documents from anywhere without needing a laptop
This is also a clever way for Microsoft to demonstrate some of the features of WindowsPhone to make it stand out among it's competitors.
If you want to find out more on how your Windows Phone can help you get through your days visit the office blog: http://aka.ms/iy30oy.