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Event ID: 9528 Source: MSExchangeIS

The SID S-1-5-18 was found on 2 users in the DS, so the store cannot map this SID to a unique user. The users involved are: /DC=WS/DC=PCSI/CN=CONFIGURATION/CN=WELLKNOWN SECURITY PRINCIPALS/CN=SYSTEM /DC=WS/DC=PCSI/CN=FOREIGNSECURITYPRINCIPALS/CN=S-1-5-18 Please use the Exchange Active Directory Cleanup utility to merge the duplicate objects together.
As per Microsoft: "Explanation: The same security ID was associated with two or more users.
User Action: Assign the primary mailbox owner to the correct user". Check the link to "The Active Directory Connector Account Cleanup Wizard" for more details.

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