Our company is looking to build a web-based knowledge base system that can be used by our clients/end users to reduce the amount of support calls.

Couple important notes:

• This is aimed at our end users, in other words, non-techies. So the UI has to be easy to use
• Should have the excellent (fast, accurate) search
• Should have ability to rate and comment on articles
• This will only be maintained by one or 2 people, so security isn't a big concern

Something similar to what Microsoft is doing with their Knowledge Base. http://support.microsoft.com/search/

Does anyone have any recommendations on what software I can use?

Thanks,

H.

Edit: I should have made this clear before but I don't mean build as in having our developers build a support/kb system from the ground up. I am looking to use a existing software package/solution that can be used to implement a knowledge base/support site.