Protection against viruses, worms and Trojans     
Viruses, worms and Trojans are programs that damage software programs or the operating system.

Protection against spy/adware    
Spyware collects personal and private data such as passwords. Adware are programs that show annoying pop-ups.

Extra protection against email viruses (POP3)    
Most virus attacks are by email. These attacks are detected with a POP3 scanner before they arrive on your PC.