to help prevent malicious code running outlook 2010 lync

above behaviour may occur if the following registry key is present: 

HKEY_CURRENT_USER\Software\Microsoft\Office\Common\Security\ 
DWORD: DisableAllActiveX 
Value: 1

Note: The above registry value does not affect the default Outlook Contact Form.

Resolution:

To resolve the problem, either rename the DisableAllActiveX registry key or change the value to 0.