I have Outlook 2007 on exchange 2003.
When I send a meeting request, say to 10 people, I also receive a copy of that request which is normal. When I delete because I really dont need it, It send it to those 10 people again and to me. I tried testing it over and over even rebooting my computer, rebooting the exchange server, when i delete the request that I sent, I receive it again. So if I delete it 10 times, those 10 people I sent the meeting request to receives it 10 times as well.