XCCC: MAPI Error Codes Encountered in Exchange 2000 Server

There is a Mail Application Programming Interface (MAPI) component for use in Active Server Page (ASP) code. It was formerly called Active Messaging, but is now called Collaboration Data Objects (CDO). To allow for greater functionality from the object library than was available in Active Messaging 1.1, the objects were replaced by CDOs. CDOs are objects that support capabilities beyond simple messaging into the areas of calendaring, collaboration, and workflow.

ASP technology is used very widely in Exchange 2000 conferencing and as a result, you may encounter a variety of MAPI warnings and error messages.

This article lists all the MAPI error codes.

The optimal return value for any call to MAPI is zero, which signifies that the call is successful and is producing the expected results. However, MAPI may return a warning value (CdoW) or an error value (CdoE) to the CDO libraries. A warning signifies a partial success with possible unexpected results or side effects. An error indicates the call was not successful. All warning and error return codes are nonzero.

As you can see, the warning values have the high-order bit zero, while error values set it to one.

The following table also lists a column for the decimal equivalent, which is primarily for the benefit of scripting in Visual Basic.