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NOTE: The procedures in this article only apply if you have installed Outlook with the Corporate or Workgroup option. With this option, you can use Messaging Application Programming Interface (MAPI) services. To determine your installation type, click About Microsoft Outlook on the Help menu. If you have the Corporate or Workgroup installation, you see "Corporate or Workgroup".
After you click the Setup Secure E-mail button in the Security tab of the Options dialog box in Outlook, you may receive the following error message:
This occurs even if the memory usage it is not very high, and all programs are closed.
Out of Memory or system resources. Close some windows and try again.
This behavior can occur if you do not have Microsoft Outlook Express installed. There are certain features in Outlook that rely on Outlook Express files.
To resolve this behavior, add Outlook Express to your computer. To do this:
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/230076/EN-US/ )OL2000: Why Outlook 2000 Requires Outlook Express