I'm currently scouting the market for a software documentation and user guide solution for our organisation.
We are a mid-sized .Net software shop currently shipping compiled .chm files with our releases, a process we feel is somewhat antiquated and doesn't give us the possibility of a proper layout. Since we want to use this documentation as a user's manual we require modern template options and media support. The documentation creation is supposed to switch from developers to product managers and therefore has to be easily usable for non-programmers. We plan on distributing a working offline mirror of this documentation with releases, therefore the option to offline distribute is vital. The option to also host this documentation online and fully browse-able would be a big bonus. We are somewhat scared of security holes, so code quality and update policy are a big concern for us. Licencing costs are possible, if the paid solution offers more advantages. Commercial deployments (possibly with modifications) are a must.
I have so far looked at quite a few Wiki and CMSses, but am somewhat lost as to which software would be a maintainable solution for our specific requirements. I also feel like our requirements shouldn't be outlandish enough that nobody offers specialized solutions for this topic.
I am grateful for any help you can give me.