Will Microsoft or Yahoo! provide coding support to assist with the transition?
Not directly. However, by providing you as much time as possible to code to the adCenter API via your Sandbox access – coupled with the specific migration documentation and community support – our goal is to have multiple resources to help guide you through this process. adCenter API documentation and samples are available on MSDN. Also, please visit the adCenter API Community and the MSDN Forums for active discussions and useful information from other adCenter API users.