OL2000: An Encryption Failure Occurs When You Upgrade from Exchange Client 5.0 to Outlook 2000

This article was previously published under Q264389
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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:
File containing security information could not be found.
You receive this error message when you upgrade Microsoft Exchange Client 5.0 to Outlook 2000 or Outlook 2000 Service Release 1 (SR-1).
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:
276367 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.

Article ID: 264389 - Last Review: 10/20/2013 21:20:17 - Revision: 4.3

  • Microsoft Outlook 2000 Standard Edition
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