Yesterday I was altering an automated installscript in order to remove a faulty package during client installation. All installation packages are linked to a certain "installation OU". I unlinked but didn't delete the link and it produced some strange results. It appeared that the script included said package but didn't execute it and this caused a great mess.
I thought unlinking a GPO would "deactivate" it but obviously I was wrong, so what is the real differens between unlinking and removing the link?