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Event ID: 9514 Source: MSExchangeIS

Two objects in the Directory have the same proxy - <address> and <address>.
In my case this was due to a duplicate SMTP address that existed in both accounts. Removing or renaming the address in one account solved my problem.

Check ME555419 if you get the error:

Two objects in the Directory have the same proxy - /DC=com/DC=abc/DC=Server/CN=Users/CN=Microsoft Schedule+ Free/Busy Connector (Server) and /DC=com/DC=abc/CN=Users/CN=Microsoft Schedule+ Free/Busy Connector (Server).

Check ME318774 and TB218247 if you get this on an Exchange 2007 server.
As per Microsoft: "This warning event indicates that there are two objects in Active Directory that have the same e-mail address. Such a situation can lead to mail delivery failures and should be resolved immediately. There could be several causes for this situation. For example, during migration, the Active Directory Connector (ADC) might create duplicate objects". See MSEX2K3DB for additional information about this event.

See ME286792, ME925816 and ME926094 for situations in which this event occurs.
According to Microsoft, this problem may occur in situations where the hotfix that is described in ME328905 is installed on the server, and where a NULL value is incorrectly dereferenced in Phatq.dll. See ME811302 and ME555419 for more information on this event.
If using Exchange 2000 Outlook Web Access (OWA) see ME269498 link below.
See ME258058 link below.

Article ME318774 gives a good description and solution for this event.

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