The "CB Trello SharePoint Tasks Synchronization" product is no longer available. BUT:
If you want to integrate Trello tasks with SharePoint or Trello tasks with Exchange, Connect Bridge can help you. It's a professional software integration platform for developers. We use it to build globally used products, and you can too.
You may also be interested in these other solutions for SharePoint productivity:
Dynamics CRM - SharePoint Integration
SharePoint - Exchange Integration
Salesforce - SharePoint Integration