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Q. You do not receive a warning message when you specify a duplicate e-mail address in the Active Directory Users and Computers MMC snap-in on Windows Server 2003 with Exchange System Management Tools installed?

When you use the Active Directory Users and Computers MMC snap-in to add or change an e-mail address, no notification of a duplicate e-mail address is generated, so Maildsmx.dll (Exchange Extension) cannot check for uniqueness.

NOTE: You only receive the This e-mail address already exists in this organization warning when the management console notifies Maildsmx.dll that an e-mail address has changed.

To workaround this behavior, use the Find feature in Active Directory to make sure that the e-mail address you want to specify is not used by any other object.

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