Hello everybody It's a hard monday for me. I press the "Special Delete"-Button on a SCCM-Collection. All the Resources in the Collection was removed from all the collections, the next run of AD Discovery had add this again to SCCM. But the resources aren't approved and i think they aren't linked to the original machine. I have read a lot about the heardbeat recovery, but it will not work on my sccm-resources. Or i can't used it ;) The heardbeat recovery is configured as standard for all 7 days. The AD Discovery have i disactivated now! Can you give me a tip how i can recover the original resources back to sccm? thanks a lot! h2o