I often close Microsoft Outlook by accident. Is there a way to have Outlook present a prompt that lets me cancel or confirm the closing operation?

Here's a little trick to help with that. Create a message to yourself. Before sending it, click the Options button and select the Do not deliver before check box. Enter a delivery date and time that's some time in the future, but the exact date doesn't really matter. Send that message. Now go to the Outbox and open the message, then close it without resending it. The message should appear in the Outbox in normal type, not italics.

As long as that message remains in the Outbox, closing Outlook displays a prompt that items are still in the Outbox. Figure 1 shows the prompt; you can click No if you closed Outlook unintentionally and don't really want it to quit.