I downloaded this tool, which I've used on other systems before, and I cannot get it to install on my system. I get an error message about it only being installable on Windows 2000 SP4, XP SP2, 2003 SP1, and Vista. My machine is Server 2003 R2 SP2. I also have some server 2008 machines that I might end up installing SolarWinds products on. Any chance that the tools will support modern operating systems anytime soon?
RinceWind - You can install the eval version of the Engineer's Toolset on modern operating systems, and when the the eval period expires, it will enter "Free Tool" mode - which includes the Advanced Subnet Calc.