I am using the free utility Cliptray. It works like it says, however when Excel or Word is opend I get "dinged" because something in them doesn't agree with it. Other problems are: dragging and dropping in Excel causes an error in Cliptray it can't find something or it can't empty the clipboard (neither was asked for). I end up with multiple error messages that have top be removed form the system, or whatever you are attempting to do may not work. It does retain copied items for use in programs such as Lotus Notes that doesn't support the Ms Office clipboard. I tried to submit a help request to them, but was sent to some webpage in French, I don't read French.
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