In Exchange 2000 Server, a recipient does not receive an attachment when you send an e-mail message together with a signed attachment (895408)

Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft Exchange 2000 Server service pack that contains this hotfix.

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

http://support.microsoft.com/contactus/?ws=support

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 usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

Because of file dependencies, this update requires Microsoft Exchange 2000 Server Service Pack 3 (SP3).

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

301378 How to obtain the latest Exchange 2000 Server service pack

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

   Date         Time   Version            Size    File name
   --------------------------------------------------------------
   18-Jul-2005  22:34  6.0.6617.79       262,144  Exmime.dll       
   16-Jul-2005  06:42  6.0.6617.79     2,342,912  Mdbmsg.dll       
   18-Jul-2005  22:34  6.0.6617.79     4,710,400  Store.exe

MORE INFORMATION

After you install this hotfix, you must create and set a new DWORD value for the following registry subkey:

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

To create and set the new DWORD value, follow these steps.

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\InternetContent
On the Edit menu, point to New, and then click DWORD Value.
In the details pane, type the new value ConvertPKCS7SIGAttachmentToMAPI.
Right-click ConvertPKCS7SIGAttachmentToMAPI, and then click Modify.
In Edit DWORD Value dialog box, click Decimal under Base.
In the Value data box, type 1, and then click OK.
Quit Registry Editor.

Note If the ConvertPKCS7SIGAttachmentToMAPI DWORD value is set to 0 (zero), Exchange 2000 Server does not convert signed MIME attachments to RTF format.