It is pretty vital these days to make sure your computer is suitably protected against the various online threats that exist. As such, having a firewall installed and configured is pretty useful. Windows has a built-in firewall that is pretty basic but easy to use, and for some people this is all they need.
For a more confident level of protection, meanwhile there are several other suitable firewall utilities that you might choose from that can enhance or replace the functions of the native Windows utility.
However, you can never have enough protection on your computer.
Windows 7 owners should take advantage of the Microsoft Security Essentials suite (aka Windows Security Essentials), which provides various scanning tools for removing threats. This is a useful application which delivers an additional layer to the basic Windows security options.
However, this doesn’t mean that you shouldn’t use any firewall software, as such security software is vital in this day and age. You might use the Windows firewall, for instance, but using a third party solution and running multiple firewalls will mean added protection (although there is the downside that some software requiring online access will be trickier to configure).
Note that although it is a security tool, Windows Security Essentials doesn't have a firewall and therefore there is nothing that will conflict with Outpost Pro’s firewall or that of any other software.