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How to prevent Outlook from closing accidentally?

When using Outlook, you might have accidentally closed Outlook by clicking the Close button or the exit button. When clicking on these two buttons, Outlook will close immediately without any prompt. So you need to reopen the Outlook application. When restarting, it might take long time to update all information if there are huge of items existing in Outlook. You must don’t like your work to be interrupted by this way. A good method for preventing Outlook from closing accidentally is to pop up a prompt box when clicking the Close or Exit button. This article will show you a trick of how to pop up a prompt box while clicking the Close button.

Prevent Outlook from closing accidentally

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arrow blue right bubblePrevent Outlook from closing accidentally

Using unsent method to prevent Outlook from closing accidentally, please do as follows.

1. Create a new email message by clicking New Email under Home tab.

2. In the Message window, please do as follows:

1). In the To field, please type in your own email address;

2). Type the email subject in the Subject field.

3. Then click File > Info > Properties. See screenshot:

4. In the Properties dialog box, go to the Delivery options section. Check the Do not deliver before box, and select a future deliver date and time (a year or longer as you need). Then click the Close button.

5. When it returns to the Message window, please click the Send button to send this email.

6. From now on, when you click the Close button or the Exit button in Outlook, a prompt box will pop up to remind you of you unsent message in the Outbox.

If you really want to close the Outlook, please click the Exit Without Sending button;

If that’s your accidentally closing, please click the Don’t Exit button.


1. When the delivery date is reaching, the email will be send automatically from the Outbox.

2. If you still need the prompt when closing Outlook, please create a new message with the above method again.

3. This method is applied to Outlook 2010 and 2013, and not take effect for outlook 2007.


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  • To post as a guest, your comment is unpublished.
    Cindy Reiter · 8 months ago
    Can you set this up so it happens daily or do you have to create this message every day?
  • To post as a guest, your comment is unpublished.
    Brian U · 10 months ago
    You are a genius. MS? not so much.
  • To post as a guest, your comment is unpublished.
    Linda Ewen · 1 years ago
    You would think that after all this time Microsoft would have some solution.
  • To post as a guest, your comment is unpublished.
    MARK PRITCHARD · 1 years ago
    It seems this only works in Cached Exchange mode.
  • To post as a guest, your comment is unpublished.
    Ryan · 1 years ago
    It is not working for me using MS Office Professional Plus 2016 (16.0.4549.1000). Any other suggestions? Thanks.