Antivirus & MS Exchange

We recently installed a demo version of the Norton AV for MS Exchange. I really liked the demo, but when we went to buy the licenses, talk about getting gouged.

Does anyone know any other solutions for Exchange that aren't going to cost us half our yearly profits? I have some pretty idiotic users who can't seem to realize that you don't open every attachment you get. <IMG SRC="smilies/mad.gif" border="0">

Just a thought (although the norton exchange is awesome) if you use outlook , you could install the patch that microsoft has and then they wouldnt get those attachments to open, lol

Here at my work we run mcaffee on our exchanged server and on all our other workstations and servers. its faster more stable and takes up less resources than notron