First of all, note that Outlook synchronization works only on MS Windows (2000, XP and up) with Outlook (2000, 2002, 2003, XP, 2007).
The Outlook synchronization is implemented as a Java applet. This applet is loaded into your browser and executed by a special Java plug-in. You need the Java runtime environment 1.5 or better, which is supported by all current browsers.