Article ID: 264389 - View products that this article applies to.
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When you try to open an existing encrypted message or try to send a new encrypted message in Outlook 2000, you may receive the following error message:
You receive this error message when you upgrade Microsoft Exchange Client 5.0 to Outlook 2000 or Outlook 2000 Service Release 1 (SR-1).
File containing security information could not be found.
To resolve this problem, obtain the latest service pack for Microsoft Office 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/276367/EN-US/ )OFF2000: How to Obtain the Latest Office 2000 Service Pack
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.