Computer software for use by communications service providers to access, create, collect, sort, remove, transfer, disseminate, organize or otherwise utilize voice, text, graphics or other data over a global computer network and other networks, and for use by communications device manufacturers to enable their devices to access, create, collect, store, remove, transfer, disseminate, organize or otherwise utilize such data over a global computer network and other networks, and user manuals sold together as a unit; computer operating system, namely, a client/server platform consisting of hardware and software for linking wireless applications with enterprise networks and the Internet; computer software for use in facilitating communications over computer networks, namely, electronic messaging software; server software for interfacing hand-held devices, such as pagers and cellular phones, to host computers, servers and the global computer network; network address software for identifying directories, domain names and network addresses to transmit data to a specific address via the global computer network; computer software, namely, a message transport agent for directing electronic mail across the Internet based on open standards and incorporating high security and ease of use; computer software for updating and integration of data, user specifications and network specifications over wireless and wireline networks; computer software for synchronizing contact, calendar, task list and other information between a personal computer and a hand-held device; computer software for determining location, presence or availability of a hand-held device