Question : Antivirus recommendations

Hi Guys,
I have a SBS 2003 server with Trend Micro Worry Free Advanced and a Windows Server 2008 Terminal Server. We have 10 workstations in the office that is fully protected with the Trend Micro Worry Free Advanced. Now my questions : we have two other companies using terminal services at this head office for accounting services. at these two companies there is no server and only two workstations at each company. Would it be a good idea to push the head office Trend Micro installs to these 4 workstations at the two companies? We do have a roaming user facilty on trend micro so any updates will go through its own companies internet connection. What are the pros,cons, and other options?

Answer : Antivirus recommendations

Yes, cover all entry points to your system with an antivirus solution that you have control over

Pro - fully covered system and antivirus solution

Con - cost for each workstation