In Outlook, when I accept a meeting invite, Outlook automatically deletes the invite. This behavior used to bug me, because many times the email would contain important information on stuff that I had to work on.
Finally figured out that this behavior is configurable and you can turn it off through a dialog that is buried many levels deep.
Tools –> Options
Preferences Tab –> click button “Email Options” (under Email section)
Email Options dialog –> click button “Advanced Email Options…”
Advanced Email Options dialog –> Uncheck “Delete meeting request from Inbox when responding”