Zimbra Desktop No Longer in System Tray

[valley_girl1919]

I have had zimbra desktop downloaded for a while now, and for the longest time once i pulled up zimbra desktop it would also show in the system tray on my toolbar. When I got new mail a little envelope would show in the system tray and a pop up would come up telling me what the email was. The past couple of days it all of a sudden stopped. I havnt done anything to my pc. I use windows xp. How do I put it back in my system tray?