mayesh

hello everybody,
im a new network administrator and i was wondering if there is any tool (for free offcourse) that helps manage licenses of microsoft on a network.
meaning - i need to to know the product key of microsoft windows and microsoft office that is installed on each station on my network.
i know microsoft suggest a kind of tool called MSIA, but it doesnt show the product key, microsoft also offers the tool that i am searching, but not as a freeware....so, any suggestions will be very appreciated.

thanks.