An Integrated Messaging System which integrates mail from a plurality of mail servers handling messages of different media types such as text, voice, facsimile, video and image. The IMS maintains the in-basket for all mail systems, eliminating the need to collect each type of mail separately. Any terminal interface, telephone or computer workstation can be used to collect, generate and act upon a message of any media type. Further, from the preferred system, the user can request another file server and its associated terminals to perform messaging services. The system includes a variety traditional E-mail and voice mail functions which can be used for any message. The IMS also includes synchronization means which checks to see whether the mail count in each in-basket is the same to guarantee that the same mail items are in each file server in-basket. An integrated messaging protocol is used to pass information between the file servers. It is designed in a generic manner to allow wide variety of foreign message formats at each of the respected media file server. For the majority of transactions, the protocol is independent of message body format, referencing only the message pointer or header.