The OpsMgr 2007 Agent Installation Account is an OpsMgr resource account with administrator privileges used to install its agent software on the resources you want to manage.
When you want to create a new managed computer resource this account is used to install the necessary software on the machine and that is why it needs to be an administrator account with elevated privileges on the managed resource. Because the account is encrypted before being used and then discarded after the installation it is a very secure way to install the agent software.
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