You now know all about sending out your own meeting requests, but what if someone sends you one? Well, accepting or declining a request couldn't be easier. Open the meeting request as you would any other e-mail message. Then, accept by pressing ALT+C, use ALT+N to tentatively accept, or decline by using ALT+D.
If you want to attend a meeting but the time isn't convenient, then propose a new time by using ALT+S, as indicated on the Standard toolbar underlined letter.