Works across any in-browser apps you use online. Take Xero for example_
Your Xero contacts directory, SalesForce CRM, online database - or anything else that lists an email address for that matter - will now display a clickable GetBusy icon to its right. Simply click the icon next to send that email to open up a history of all your past conversions together on GetBusy. Send them new tasks, or browse through old history. You are essentially adding a powerful task management, document management and secure communication system to every list of emails you see online (such as the Xero contacts directory)!