Outlook jump list cannot display task button

I was able to find this Support KB referring to your OLK2013 Task List / Pining issue.


http://support.microsoft.com/kb/2781583/


Recommended steps:
To export and delete the LastUILanguage registry value, follow these steps: 


1.Unpin the Outlook 2013 icon. 
2.Exit Outlook 2013. 
3.Use Regedit to export the following registry key: 


HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook 


4.After you export the Outlook registry key, delete the LastUILanguage registry value. 
5.Start Outlook 2013, and then re-pin the icon.