Recently, a Consumerist tipster sent in an internal memo from Macy's explaining that the store was "flipping" 3.5 million inactive store accounts into Citibank Mastercards.
...
As far as we can tell, Macy's is taking advantage of an "information sharing" clause in their original store card agreement. The clause states that Macy's is allowed to share information with Citibank as an "affiliate" of Macy's. Opting-out of the information sharing agreement requires calling or writing Macy's.
...
While we do not have specific information about the methods Citibank is using when they "flip" the inactive Macy's accounts, we find it hard to believe that it will not affect credit scores.
http://consumerist.com/consumer/leaks/got-an-inactive-macys-store-account-heres-your-new-citibank-mastercard-290408.php----------------------
Goes to show how companies are using your information in unanticipated ways.