Microsoft KB Archive/255904
Article ID: 255904
Article Last Modified on 10/26/2006
- Microsoft Outlook 2000 Standard Edition
This article was previously published under Q255904
If you compile an application that uses the simple Messaging Application Programming Interface (MAPI) call, cmc_logon(), to run in 16-bit mode by using Microsoft Visual Studio version 1.5, when you run the application you may receive an error message that states that cmc_logon() does not work with an unknown error.
This issue can occur because some CLSIDs (class IDs) that are required for simple MAPI 16-bit applications are not registered during a clean Outlook 2000 installation.
To resolve this issue, create a text file with a .reg extension and add the following entries to the file:
After you create the file, double-click the file that you just created in Windows Explorer.
To work around this issue, upgrade from Outlook 98, rather than performing a clean installation of Outlook 2000.
Additional query words: OL2K
Keywords: kbprb KB255904