A method, system, means, and computer program code for integrating instant message into unified message service. According to embodiments of the present invention, each unified message user not only have a unique phone number for its unified message service, but also have a corresponding HTTP URL for its instant message service and messages management center. Caller that call user's unified message number can leave message, send fax and call forward to any phone number or Internet-connected computer with microphone and speaker (Phone to PC). User can use telephone to listen its voice message, text message by text-to-speech and use fax machine to retrieve and send fax/email and also can use computer to check its voice message, text message, email, fax as well as to send fax and SMS. Anyone can access the user's URL for Instant Message in any Internet browser, if the user is online, then they can chat to each other. If the user is offline, then the people can leave text or voice message to the user or choose to call the user's unified message phone number (PC to Phone), then the unified message system can route to leave message or send fax or call forward to any phone number based on user's predefined rules.