1. In outlook simply navigate to the File Tab on the ribbon.
2. On File Tab select the Automatic Replies button as show above.
3. Then in the new Automatic Replies Window you will select the Send automatic replies radio button.
4. Then select the checkbox "Only send during this time range.
5. Now you will enter your out of office message or copy from the one above and replace the dates with your actual out of office dates.
6. Now select the "Outside My Organization Tab" as show above and select the "Auto-reply to people outside my organization" checkbox.
7. Select the radio button named "Anyone outside my organization."
8. Now enter your own message or you may copy the message shown here on screen shot.
9. Once that is completed you may simply select the "OK" button and finished.