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How come it wont let me add someones Email on Exchange 2007?

fstinc asked
Last Modified: 2012-05-11
When I try to add an email address to a mail box, it does not allow me to. The message reads:

"The proxy address "smtp:xxx@contoso.com" is allready being used by "contoso.com/xxx". Please choose another proxy address"

Thanks it would really be helpful
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