Solving “e-mail address already exists in this organization” using LDAP query in ADUC

Posted by Dave B on Mar 11, 2013 in Support |

Using the Windows 2003 Active Directory Users and Computers utility, right click on the domain, choose Find. In the Find: dropdown list, choose “Custom Search” and in the In: dropdown list, choose “Entire Directory”. Click the Advanced property page and enter the following LDAP query (in my example, at least):

proxyaddresses=smtp:user@domain.com

Click Find and you should find the object that already has that SMTP address.

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