The Calendar and Address Book client modules are deployed as a single web application in any web container. The mail module is rendered by the Messenger Express. Messenger Express is the standalone web interface mail application that uses the HTTP service of the Messaging Server.
Figure 23–1 shows the Communications Express software architecture.
Communications Express consists of the following modules:
Calendar. The presentation layer of the Calendar module is based on JavaServer PagesTM. These JavaServer Pages pages can be customized to suit the requirements of the client. The data layer accesses a Java API for Calendar (JCAPI) to enable exchange of data with Calendar Server over HTTP-based protocol.