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Event ID 9548 is logged for Disabled User Accounts which do not have a master account SID

Author:
Mohammed Athif Khaleel MVP
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SUMMARY
Event ID 9548. Disabled user /O=Organization/OU=SiteName/CN=RECIPIENTS/CN=User_Name does not have a master account SID (msExchMasterAccountSid). Please use Active Directory MMC to set an active account as this user's master account.
SYMPTOMS
Event Type: Warning
Event Source: MSExchangeIS
Event Category: General
Event ID: 9548
User:  N/A
 
Description:
Disabled user /O=Organization/OU=SiteName/CN=RECIPIENTS/CN=User_Name does not have a master account SID. Please use Active Directory MMC to set an active account as this user's master account.
For more information, click .
CAUSE
This event is seen for instance where a user account associated with mail box is disabled and does not have an msExchMasterAccountSid as associated external account attribute is not set or vice-versa where in the disabled account is enabled which already has msExchMasterAccountSid.
RESOLUTION
Since msExchMasterAccountSid attribute does not exist on disabled user accounts, mail delivery will fail and to resolve this you need to set this attribute on the disabled user account. To resolve this, grant the SELF account Associated External Account and Full Mailbox Access permissions to the mailbox using Active Directory Users & Computers. For complete steps refer to KB article
MORE INFORMATION
If you have more number of disabled user accounts who does not have msExchMasterAccountSid, you have to obtain the 'NoMAS' Tool from Microsoft Product Support Services, PSS.
 
More information on using NoMAS is explained by Neil Hobson in his excellent article on
Properties

Article ID: 555410 - Last Review: 08/16/2005 21:55:16 - Revision: 1.0

Microsoft Exchange Server 2003 Enterprise Edition, Microsoft Exchange Server 2003 Standard Edition, Microsoft Exchange 2000 Enterprise Server, Microsoft Exchange 2000 Server Standard Edition

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