Microsoft KB Archive/157822

= XCLN: ErrMsg "An extension failed to initialize..." =

Article ID: 157822

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Client 4.0

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This article was previously published under Q157822



SUMMARY
When you attempt to start the Microsoft Exchange Windows NT client with the Exchange Server and Microsoft Mail services running, you may receive the following error message

An extension failed to initialize. The extension entry contains invalid parameters.

where is an MS Mail 3.x extension such as "0;;;;;;;;;;".



CAUSE
There is an Msmail.ini file in the Winroot directory. WINROOT is the directory which Windows NT Workstation or Windows NT Server was installed.



RESOLUTION
To resolve this problem:  Rename the \Winroot\Msmail.ini file to *.old.

NOTE:In some cases the file that needs to be renamed/deleted is msmail32.ini rather than msmail.ini.

-OR-

 Remark out the invalid entry or entries referenced in the error message by placing a semicolon at the beginning of the line. The invalid entry or entries may be located in one (or more) of the following sections of the Msmail.ini file:

[Custom Commands] [Custom Menus] [Custom Messages]





MORE INFORMATION
The Microsoft Mail service for the Microsoft Exchange client checks for and uses entries in the MSMAIL.INI file.

Additional query words: sfs pcmail

Keywords: kbusage KB157822

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