Our 2 companies have just merged and can't decide what Internet mail
address to assign people. Originally we used one address, but now are
slowly regressing  to 2 with indications that we may go back to the one
address again. In the meantime, I receive error messages.

Can addresses be globally replaced thru Windows Explorer, selecting the
appropriate mail lists (I have 20 lists), and doing a replace on the name?
Or is there some other way? The format I would be changing (as an example):

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change to
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