Read original post by Jeff Kunins at Building Windows 8 Blog
Managing "contacts" has been a bit of a challenge for many, especially as the number of places that contacts can be stored and the number of PCs and devices we use to access those contacts has increased. Storing contacts in the cloud for easy roaming and connectivity is a part of the solution. With Windows 8 and the new People app, we are taking cloud storage a step further by optionally connecting it to other services you already use. This brings together email contacts and contacts from your service / social accounts in one easy to access and use place that roams across your Windows 8 PCs and phone.