The EXOLEDB component is not initialized successfully when you start Exchange Information Store Service on an Exchange Server 2007 server

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Article ID: 977181 - View products that this article applies to.
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When you start the Microsoft Exchange Information Store service on a Microsoft Exchange Server 2007 server, you may find the EXOLEDB component is not initialized successfully. Additionally, the following event is logged in the Application log:

Event Type: Error
Event Source: MSExchangeIS
Event Category: General
Event ID: 9542
Description: Initialization of external interface OLEDB failed; Error ecServerOOM.

Note Even though the Exchange Information Store service is started, there are various issues caused by the unavailability of the EXOLEDB component.


This issue occurs because there is a key under the HKEY_CLASSES_ROOT path and the default value of the key is not of the REG_SZ type. However, Exchange Server 2007 makes an invalid assumption that all default values of the keys under the HKEY_CLASSES_ROOT path are of the REG_SZ type.


To resolve this problem, install the following update rollup:
972076 Description of Update Rollup 2 for Exchange Server 2007 Service Pack 2


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


Article ID: 977181 - Last Review: January 25, 2010 - Revision: 2.0
  • Microsoft Exchange Server 2007 Service Pack 2, when used with:
    • Microsoft Exchange Server 2007 Enterprise Edition
    • Microsoft Exchange Server 2007 Standard Edition
kbhotfixrollup kbqfe kbfix kbexpertiseinter kbsurveynew KB977181

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