There is a lot customer discontent about the news that Dimdim's free service will be discontinued after the closing of the sale to Salesforce.com.
DimDim simply sent a five sentence email notifying customers that the service will be deactivated on March 15th. Not very impressive in terms of customer communication. The email contained an FAQ that has 11 questions and answers to inform customers about the service's discontinuation.
Dimdim's closing is a study in the risks of using free Webinar and conference call services and a wake up call about using free tools for business use in general. They do go away. You can't make money with free by adding volume.