Be VERY careful when you choose DimDim!
I bought their enterprise licenses. I have to tell you that it simply does NOT work! They force you to pre-pay annually. If anything goes wrong, there is no refund.
1) Audio: only 4 people can use microphone, other people have to pay long distance calls. In addition, many home PC users don't have phone sitting beside their computer;
2) Whiteboard and Recording: they claim DimDim can record courses, but only audio and video are recorded (with very bad quality). Whiteboard and anything else are not recorded. If only record audio and video, why bother use this product? You can simply use YouTube.
3) Moodle-Integration: It does not work! If a Dimdim account is reused by a teacher, there are many scenarios that subsequent meetings fail to start.
Bottom Line: Do Not buy this product!