In this SolarWinds Orion NPM review we have tested version 11.5 and 12.01; The latest version is 12.1
Orion NPM has all the traditional architecture components that we would expect from a network performance management system. A Polling engine, Alerting Engine, Webserver, Reporting Engine and a database. It installs on a Windows server and requires IIS.
One of the key benefits (and selling success) of Orion is that it has a flexible (visual) map that can be integrated into the web-console. Drill down of maps is possible.