Fabian: I'm way out of you guys' league. I wouldn't know a stack trace from my elbow, but I'll do what I can to help. Just say so and tell me how. As far as whether I can tell if the MapiClient displayed all the rows or just a subset? Well, I actually did the MapiClient runs with 40million rows. It took awhile for it to role through them all, and of course, without the exception. Query results with less rows took less time. I can't say for sure if it actually showed all the rows or a subset, but I just assumed it was all of them because of how long it took to work through it. I'm afraid I am unaware of how to know if it showed all the rows or a subset. I only saw the beginning and the end of the runs, and that much of it seemed right. If there is any way I can help, just let me know. George