Microsoft KB Archive/308153

= XADM: The Attachment Names Do Not Change with the Attachment Content =

Article ID: 308153

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition
 * Microsoft Exchange Server 5.5 Service Pack 1
 * Microsoft Exchange Server 5.5 Service Pack 2
 * Microsoft Exchange Server 5.5 Service Pack 3
 * Microsoft Exchange Server 5.5 Service Pack 4

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This article was previously published under Q308153



IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
When a user uses an Internet client (such as a Post Office Protocol version 3 [POP3] or Internet Message Access Protocol, Version 4rev1 [IMAP4]) to retrieve a message, the attachment name may not match the content of the attachment.



CAUSE
This problem may occur if the attachment was replaced by a third-party solution that is based on the virus scanning application programming interface (API).



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Microsoft Exchange Server 5.5 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:

Component: Information store

NOTE: Because of file dependencies, this fix requires Microsoft Exchange Server version 5.5 Service Pack 4.



STATUS
Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5.



MORE INFORMATION
This fix introduces a new registry key to control how the information store handles Multipurpose Internet Mail Extensions (MIME) fidelity. In messages that are formatted for Simple Mail Transfer Protocol (SMTP), the attachment name is an element of the MIME header. By default, the information store tries to maintain the fidelity of the MIME content. However, when the attachment is replaced by a virus scanning API scanner, the MIME header is not updated with the new attachment name. If you create the DisableFullFidelity registry value and set it to 1, the information store rebuilds the MIME header of messages to reflect the new attachment name.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To create and set the DisableFullFidelity value:  Start Registry Editor (Regedt32.exe). Locate and click the following key in the registry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\InternetContent

 On the Edit menu, click Add Value, and then add the following registry value:

Value name: DisableFullFidelity

Data type: REG_DWORD

Radix: Decimal

Value data: 1

 Quit Registry Editor.</ol>

Keywords: kbhotfixserver kbqfe kbbug kbexchange550presp5fix kbfix kbqfe KB308153

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