I have a user who wants to automate mailing to both Outlook and Outlook Express. I figured MAPI would be a good choice. Apparently not. When I call "mapisendmail," the function returns "-2147467259." As far as I can tell, I entered all valid data to the function. I'm not an expert though. If anyone has any tips or suggestions, I'd be very grateful. I'm using Outlook Express 6.0, if that makes a difference. Thanks.