When the Microsoft Exchange Server Move Server Wizard (MSW) is run, an
X.500 proxy address is created for each user using the old Organization and
Site name. This address is set as the primary X.500 proxy address.
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If the same server is moved again, a second X.500 proxy address is created
using the old Organization and Site name resulting from the first server
move. This address is set as the primary X.500 proxy address, with the
first X.500 address still present as a secondary proxy address.
The X.500 address is used to enable replies from the old site to be
redirected to the correct user in the new site. This feature works in
conjunction with a message transfer agent (MTA) change in Exchange Server
5.5.
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