Outlook 2013: Apps for Office

I am trying to disable the Apps for Office icon when users create a new E-mail message in Outlook 2013.
Apps for Office Icon
I've tried a couple of possible solutions so far, but none of them have removed the icon:
Disabled all apps via Exchange ECP 2013
Disabled all App Catalogs via the Office Customization Tool
...and each of the options in here:

Thanks for the help!
-IT_Crowd
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IT_CrowdAsked:
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IT_CrowdAuthor Commented:
We were able to disable the icons by creating the olkmailitem.OfficeUI file with the following code:

<mso:customUI xmlns:mso="http://schemas.microsoft.com/office/2009/07/customui"><mso:ribbon><mso:qat/><mso:tabs><mso:tab idQ="mso:TabNewMailMessage"><mso:group idQ="mso:GroupOfficeExtension" visible="false"/></mso:tab></mso:tabs></mso:ribbon></mso:customUI>

Save the file in the following folder:
C:\Users\[USER]\AppData\Local\Microsoft\Office
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