I haven't much experience with Concrete5, but I would like to use it to build a website that requires a stackoverflow type support system as part of the website.

Anyone know what's been done, or what options are available for something like this?

If no stackoverflow-clone type site can be created, what do you recommend as an alternative for creating a user-support group / forum?

I prefer something out of the box, rather than develop my own, if possible.