The present Single Sign-On Service for Communication Network Messaging provides a wireless subscriber with the ability to login with a single service provider and then move seamlessly among the allowed messaging services to share personal address book and calendaring applications. The subscriber logs into the network from either the wireless station set interface or from the WEB user interface using a laptop or personal computer to access an AnyPath Web server. Once the subscriber has signed on to the AnyPath Web server, the subscriber's account information is accessed in a centralized profile for messaging services (Short Message Service (SMS), unified messaging, voice-mail messaging) using a single directory server and integrated address book and calendar services.