Import emails ID from Gmail, Yahoo, Hotmail, etc. for "Tell a Friend" like feature in PHP

Question

In a project I have to implement a way by which a user can import all contact information from the following:

• Gmail
• Yahoo Mail
• Hotmail
• Tweeter
• Rediff Mail
• Sify Mail

Are there any freeware scripts in PHP for this?

Are there any servers that may be providing such services?

Answer 1

Check this source forge project (Contact Grabber) : http://sourceforge.net/projects/contactgrabber/

From the homepage.

Fetch the contacts of the selected site. Yahoo, Gmail, Hotmail, AOL, Lycos classes have been incorporated as they are available under GPL. Rediff, Orkut & MySpace classes have been developed at Magnet. New classes for LinkedIn & Lycos have been added.