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Error message when you try to reply to an encrypted e-mail message

This article was previously published under Q324830
This article has been archived. It is offered "as is" and will no longer be updated.
In Microsoft Outlook 2002 Service Pack 2 (SP-2), you may not be able to reply to an encrypted e-mail message. Someone can send you an encrypted message, but you cannot reply to the encrypted message. When you click Send to reply to an encrypted e-mail message, you may receive the following error message:
Microsoft Outlook had problems encrypting this message because the following recipients had missing or invalid certificates, or conflicting or unsupported encryption capabilities.
Outlook cannot retrieve the certificates that are required.
This issue may occur if an external LDAP directory is used to store the certificates and do all address resolution. For replies, Outlook does not search for certificates that are stored in the LDAP directory. Outlook searches for certificates only in the global address list (GAL), in Contacts, and in the personal address book (PAB).
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 Office XP Service Pack 2 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: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.The German version of this fix has the file attributes (or later) 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-Sep-2002  16:18:00 -           2174808    Outlook.msp   18-Sep-2002  05:42:00 -           5045088    Outlookff.msp   18-Sep-2002  04:31:00 -           3171       Readme.txt				
After the hotfix is installed, the German version of this fix will have the file attributes (or later) that are listed in the following table.
   Date           Time  Version     Size       File name        -------------------------------------------------------   08-Aug-2002 20:22:19 10.0.4406.0 137800      Impmail.dll   08-Aug-2002 20:22:29 10.0.4406.0 121416      OutlPH.dll   16-Aug-2002 14:05:14 10.0.4413.0 346696      Exsec32.dll   12-Sep-2002 20:52:33 10.0.4510.0 539208      OutlCM.dll   12-Sep-2002 20:52:36 10.0.4510.0 6310472     Outllib.dll   12-Sep-2002 20:52:39 10.0.4510.0 92744       Outlmime.dll   12-Sep-2002 20:52:41 10.0.4510.0 47688       Outlook.exe				
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.

Article ID: 324830 - Last Review: 01/11/2015 04:45:00 - Revision: 1.4

Microsoft Outlook 2002 Service Pack 2

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