A system for blending synchronous and asynchronous computer communication applications that determines when a user of a synchronous communication application, such as an instant messaging application, attempts to send a message to another user that is unavailable for synchronous communications, and that forwards the message from the synchronous communication application to an asynchronous communication application for delivery. The forwarded message may be an email message, and the system may operate to determine a destination electronic mail address of the destination user for inclusion in the forwarded message, and include an indication in the forwarded message that it has been forwarded from the synchronous communication application. This indication enables the asynchronous communication application to perform special processing when the receiving user retrieves the forwarded message from the asynchronous communication application. The special processing may include automatically determining whether the sending user is currently available for synchronous communications, and, if so, providing a synchronous communication session between the receiving user and the sending user. If the sending user is not currently available for synchronous communications, the receiving user is provided with the option of responding to the forwarded message using the asynchronous communication application.