If Outlook terminated during operation, the Mail Mining Add- in could be disabled.
If restarting Outlook does not fix the problem, Select Tools > Trust Center. Click Add-ins. In the bottom of the Window select Manage: Disabled Items and click Go.
Select the checkbox next to add-in: mailmining.dll. If that doesn't work select Tools > Trust Center.
Click Add-ins. In the bottom of the Window select Manage: COM Add-ins and click Go. Enable the checkbox next to Mail Mining.
System Requirements:
Windows 7, XP or Vista
Microsoft Outlook 2007