Some return addresses are changed when an e-mail recipient tries to reply to all recipients of an e-mail message that you sent in Outlook 2003

When an e-mail recipient tries to reply to all the recipients of an e-mail message that you sent in Microsoft Office Outlook 2003, some of the return addresses are changed to an SMTP address that is not valid.

This problem may occur when the following conditions are true:

• The LDAP-based address book in Outlook 2003 is used to address an e-mail message.
• The message is then sent to a recipient through an X.400 connector.

How to obtain the hotfix

This issue is fixed in the Office Outlook 2003 Hotfix Package that is dated April 5, 2006. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

How to enable the hotfix

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.

To enable this hotfix, follow these steps:

1. Exit all Office 2003 programs.
2. Click Start, click Run, type regedit, and then click OK.
3. Expand the following subkey:
   HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles
4. On the Edit menu, point to New, and then click String Value.
5. Type 001e6624, and then press ENTER.
6. Right-click 001e6624, and then click Modify.
7. In the Value data box, type the value that matches the textEncodedORaddress that you used when you configured the X.400 address to work with the Outlook LDAP service.
8. Click OK.
9. Click Edit, and then click Find.
10. In the Find What box, type 001e6600, and then click Find Next.
11. Repeat steps 4 through 8 in each key that contains the 001e6600 subkey.
12. On the File menu, click Exit to exit Registry Editor.

For more information about how to determine the textEncodedORaddress that you used when you configured the X.400 address to work with the Outlook LDAP service, click the following article number to view the article in the Microsoft Knowledge Base: For example, information that resembles the following will be used in the 001e6624 subkey: Note The information in this example is not intended to be a final solution. You must determine the correct textEncodedORaddress to use.

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