Problem:
You wish to enable calendar weeks in the Outlook 2010/2013 via GPO. How can this be done?
Solution:
Changing this setting could be easily controlled via a GPO.
Outlook 2010:
User Configuration\Administrative Templates\Microsoft Outlook 2010\Outlook Options\Preferences\Calendar Options\
Outlook 2013:
User Configuration\Administrative Templates\Microsoft Outlook 2013\Outlook Options\Preferences\Calendar Options\