From now on, you can also invite your friends on AOL, Google and Hyves to Windows Live. You choose whether to import your complete address book at once or only selected contacts.
To use this service, click on “Add people” in your Windows Live Profile or on your Windows Live Home page, and gather all your contacts in Windows Live. Have fun! 🙂
Source: http://windowsliveblog.spaces.live.com/Blog/cns!720E46AE746458F7!6064.entry