When server and network management software from a proprietary software vendor costs ten times as much as an open source alternative, the decision to go the open source route might seem obvious.
Make that open-source alternative a hosted offering, and you lighten the load even further, freeing the IT staff of server and network management duties.
http://searchopensource.techtarget.com/originalContent/0,289142,sid39_gci1222471,00.html