Event ID - 9542

Event Id9542
DescriptionInitialization of external interface OLEDB failed; Error Unknown error.
Event InformationIn Microsoft Exchange 2000 server, if you are viewing 101 EXOLEDB event ID messages and 9542 MSExchangeIS event ID messages, some MDAC components may be incorrectly registered, and you must re-register them. The following is a list of the .dll files that you must have so that you can re-register to resolve this issue. You must stop the Information Store service before you re-register, and then you can restart the Information Store service after you successfully register the following .dll files:

C:\Program Files\Common Files\System\Ole DB\oledb32.dll
C:\Program Files\Common Files\System\Ole DB\Oledb32r.dll
C:\Program Files\Common Files\System\Ole DB\Msdaipp.dll
C:\Program Files\Common Files\System\ado\Msado15.dll
C:\Program Files\Common Files\System\Ole DB\Msdaurl.dll

To register a .dll file, at a command prompt, type regsvr32 followed by the path to and name of the .dll file. For example, to re-register the Oledb32.dll file in the first bulleted item, type the following command:

regsvr32 c:\program~1\common~1\system\oledb~1\oledb32.dll
Reference LinksHow to Troubleshoot the "503 Service Unavailable" Error Message in Outlook Web Access 2000

Exchange Store Does Not Start: Errors 7024, 1026, 9542, and 5000

How to troubleshoot the "503 Service Unavailable" error message in Outlook Web Access in Exchange Server 2003

Users may receive a "503 Service Unavailable" error message in Exchange Server 2003 when they try to use a Web browser to gain access to OWA

Issues that occur when the crashonauditfail registry value is set to 1 on an Exchange computer or that occur when the Security event log reaches the maximum size in Windows 2000 Server

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