The Exchange Control Panel (ECP) is a Web-based management interface introduced in Exchange Server 2010.
Exchange administrators access the Exchange 2010 Control Panel through an Outlook Web App. From there they can perform management tasks including creating and delegating users, making configuration changes, delegating permissions to users, and much more.
Not only is the ECP a management interface for administrators, but users who have been granted the proper permissions through Exchange's role-based access control may use it as well. If granted proper permissions, Exchange 2010 users can use the ECP to do things such as track messages and create and manage distribution lists.