Youlu Address Book is symbian S60 Software that allows you to change your Sysmbian S60 environment. By Installing this program you will have some different UI thats more android/bbm-like, because it shows your instant messaging like your usual chat application. You will also have address book that can be accessed directly via its menu item.
Youlo also has backup service that will let you to backup your messages into the internet. It also has instant messenger application that can be used like other instant messenger :). So for you guys that proudly still use you nokia or symbian S60 here it is :