Business requirements for security and antivirus are different than those for home use. Commonly available internet security software for consumers will work perfectly well for home offices or businesses with only a handful of computers to protect, once the number of computers becomes large or server protection is required then specialised business security and antivirus software is required.  The most popular range of small business security software is the Worry Free range from Trend Micro:

* Trend Micro Worry Free Business Security Standard
* Trend Micro Worry Free Business Security Advanced
* Trend Micro Worry Free Business Security Professional

Hosted SaaS versions are also available:
* Trend Micro Worry Free Business Security Services
* Trend Micro Worry Free Business Security Services Advanced
* Trend Micro Worry Free Business Security Services Professional

* Trend Micro Hosted Email Security (included in Worry Free Professional)