I'm planning on switching back to ZoneAlarm Antivirus from McAfee and I've noticed there are now both free and pro versions of ZoneAlarm Antivirus + Firewall 2012. I can find product comparisons between each one and the more expensive versions (Security Suite and Extreme Security) but not between each other.

What are the differences between ZoneAlarm Antivirus + Firewall 2012 Free and ZoneAlarm Antivirus + Firewall 2012 Pro?

This would be for Windows 7 64bit if it makes any difference.

Thanks in advance!