ListCategories Method
Lists all mail categories.
Syntax
int ListCategories();
Remarks
This method lists all of the mail categories in the current mailbox. This method clears and populates the Category* properties.
Error Handling
This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)