IFC-BIM Exchange Support Forum
This is the forum where IFC software users can communicate directly with the software developers at each vendor. It is a forum where users could get answers to questions that their local vendor reps could not provide and with good use it will become a knowledge-base where answers could be found to many questions that new users experience.
Without registering you can view all the discussions. To be able to post messages you need to register.
One of the purposes of the forum is to bring together project team members to share their experiences exchanging Industry Foundation Class (IFC) formatted files between different CAD software packages.
There is also a lot of information about getting started with IFCs, the IFC certification process, and sample IFC files.
You can access it at
http://www.buildersnet.org/IFC-BIM/.