Shuold we add Internet Exporer Support

Our new SaaS project http://collabable.com (currently in Beta) is progressing niceley, we are however aware of a number of rendering issues with Internet Exlorer (6,7 and 8).

After looking at the analytics it looks like only 4% of our user base is running Internet Explorer. Like most software houses, for us, Internet Explorer is dead but until now we have always been keen to keep support for it as its still touted (in some sections) as the most used browser. Clearly for our demographic its not well used, so simple question, Shuold we kill IE support?