Hi Goofy,
You need to use the correct idMso for the "Power Pivot" tab. Once you've identified the idMso for the "Power Pivot" tab, you can use it to control the visibility in your customization XML. build now gg
<tabs> <tab idMso="TabHome" visible="false"/> <tab idMso="TabData" visible="false"/> <tab idMso="TabPowerPivot" visible="false"/> </tabs>