Difference between antivirus for server and for desktop

Greetings,

I would like to know the difference between an antivirus for server and an antivirus for desktop. How do they operate?What are the benefits/drawbacks of each? Is it possible to have an antivirus on the desktops and an antivirus on the servers at the same time? It is for professionnal use.

maybe you find the info you want here. http://www.avast.com/business

and pdf doc here. http://www.avast.com/download-documentation#business-products