Microsoft Dynamics CRM Online for Outlook is an add-in installed on your computer that allows you to work with Microsoft Dynamics CRM Online data in Outlook. After installing the add-in, there are options that must be set.
More information: Doing CRM Work in Outlook
Install Microsoft Dynamics CRM Online for Outlook
Specify how your e-mail is tracked in Microsoft Dynamics CRM Online for Outlook
Set the option to send and recieve e-mail from a user or queue
Set synchronization options in Microsoft Dynamics CRM Online for Outlook
Set address book options in Microsoft Dynamics CRM Online for Outlook