Server/network monitoring software
I'm looking for a bit of advice regarding software that will monitor my server status (mostly windows servers) and network preformance and email me (if possible) about any issues. Some of the sites I manage only have one windows server so I would prefer the software platform to run on windows.
I've looked into to software such as Nagoios, Zenos and OpenNMS but just wondered what software you lot use and what you monitor with it?
I would prefer to use free software.