It's not possible. Only interaction with contacts and calendars is possible.
You can use the Live Connect APIs to do the following things in Hotmail:
- Create new contacts, and read existing ones, in a user's contacts list.
- Create, read, update, and delete a user's calendars and the calendars' associated events.
- Subscribe a user to a public calendar, such as a list of holidays.
- Use the friend finder feature to discover whether any of a users' contacts are also registered users of your website.
From: Live SDK developer guide