windows all information: Windows Instant Messenger

Source (google.com.pk)
Windows Instant Messenger Biography
If the person has a Passport, Windows Messenger cannot reveal their e-mail address, but can send an e-mail message that explains how they can install Windows Messenger. You are added to their contact list. If the person does not have a Passport, you are prompted to send an e-mail message that invites this person to obtain a Passport and to download Windows Messenger.

Windows Instant Messenger