Communications Express provides an integrated web-based communication and collaboration client that caters to the needs of Internet service providers, enterprises, and OEMs. Communications Express has an integrated user interface for calendar, mail, and address book and enables the access of one client module from another without re-authenticating user credentials. Communication between mail and calendar is automatically established since both applications are deployed within a single web container. Also, you can optionally use Access Manager to provide the single sign-on mechanism. Both calendar and mail applications share the same address book. All modules share the common user preferences specified in the Options tab of Communications Express.