Symbian is a
mobile operating system (OS) targeted at mobile phones that offers a high-level of integration with communication and
personal information management (PIM) functionality. Symbian OS combines
middleware with
wireless communications through an integrated mailbox and the integration of
Java and PIM functionality (agenda and contacts). The Symbian OS is open for third-party development by independent software vendors, enterprise IT departments, network operators and Symbian OS licensees.