After you install the Microsoft Dynamics CRM Client for Microsoft Office Outlook and then locate the Microsoft Dynamics CRM folders in Microsoft Office Outlook, the Outlook and CRM ribbons disappear. Additionally, the Office Outlook ribbon does not reappear unless you disable Microsoft Dynamics CRM.
This behavior may occur because of registry keys that are left over from an earlier version of Microsoft Outlook.
Important: This article contains information about how to change the registry. Make sure that you back up the registry before you change it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and change the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 How to back up and restore the registry in Windows
Click Start, click Run, type regedit, and then click OK.