This article was previously published under Q303671
This article has been archived. It is offered "as is" and will no longer be updated.
If you click the Keep Personal Address in option in a PAB (Personal Address Book) file in Outlook 2000 Service Release 1 (SR-1) and you have the search order set to search in the PAB first, Outlook 2000 SR-1 cannot find the recipient digital certificate and the following error message may occur when you send a digitally encrypted message:
Microsoft Outlook had problems encrypting the message because the following recipients had missing or invalid certificates, or conflicting or unsupported encryption capabilities.
This problem can occur because the search process erroneously stopped searching after it querried the PAB, instead of continuing the search in the Contacts folder.
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language. The English-language version of this fix should have the following file attributes or later: