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I am asking for this to be an option from the client machine.  I would like to suggest this as an uninstall switch from the uninstall process on the end user device.  IE during the uninstall of the software being triggered on client machine it can also remove the device from the portal.  I am quite aware of the option to uninstall from the portal but I would like to be able to script uninstalling the software from a batch script during a decommissioning of end user devices from the device in question.   Please let me know if you have questions.