We have setup a custom property and automated a maintenance schedule that runs 24x7x365. When a node is decommed we edit the node and assign it the category of Decommissioned. At that point we have an automated task that runs and updated the xml file for the unmanaged nodes and puts them in an unmanaged state for 24x7x365 or until we remove them. Also keep in mind that there is a setting in Orion (can't remember right off hand where it is) that if its enabled Orion can/will alert out on unmanaged devices.
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