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Solution ID : SO3694

Last Modified : 06/21/2018

Error message occurs when you send an encrypted message to a recipient on the Global Address List

Problem

When you send an encrypted message to a recipient that is located in the Global Address List, 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: e-mail recipient

where e-mail recipient represents a recipient that you are sending an e-mail message to.

Error: "Microsoft Outlook had problems encrypting this message because the following recipients had missing or invalid certificates or conflicting or unsupported encryption capabilities."

Cause

This problem can occur because when Outlook searches the Global Address List for encryption certificates, it searches for three properties in the following order:

  1. Tagged-X509certsX509-certsUser-certs
  2. X509-certs
  3. User-certs

If the Tagged-X509certs property is invalid (for example, if it is expired, corrupted, and so on), Outlook does not fail over and query for any valid X509-certs or User-certs properties. For example, if the Tagged-X509certs property is missing and the X509-certs property is invalid, Outlook does not fall back and query the User-certs property, even if the property is valid. This behavior prevents the user from sending encrypted mail to other users who have an invalid digital certificate.

 

Solution

To resolve this problem, go to one of the following Microsoft Web sites:

Microsoft Outlook 97            

 http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q283206

Microsoft Outlook 98

http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q283207

Microsoft Outlook 2000 

http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q282959

Microsoft Outlook 2000 SR-1  

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q302041

The fixes above do not cover Windows XP, Office XP or Outlook 2002. For information about these e-mail programs, please contact Microsoft.