There are two ways to send automatic out-of-office replies. The way you use depends on the type of email account you have.
Click File, then select the image below that matches your version of Outlook.
If you see the Automatic Replies button, follow the steps to set up an automatic reply.
If you don't see the Automatic Replies button, follow the steps to use rules to send an out of office message.
Set up an automatic reply
Select File > Automatic Replies.
Note: For Outlook 2007 choose Tools > Out of Office Assistant.
In the Automatic Replies box, select Send automatic replies.
Optionally, set a date range for your automatic replies. This will turn off automatic replies at the date and time you enter for the end time. Otherwise, you'll need to turn off automatic replies manually.
Note: If you don't see Automatic Replies, use Rules and Alerts to set up your out-of-office message.
On the Inside My Organization tab, type the response that you want to send to teammates or colleagues while you are out of the office.
Select OK to save your settings.
Turn off automatic out-of-office replies
When Outlook is setup to send automatic replies, you'll see a message under the ribbon with this information. Select Turn off to disable automatic out-of-office replies. If you want to modify the dates for your automatic reply or the message sent, use the steps above to modify your settings.
Note: For Outlook 2007, to turn off out-of-office replies, select Tools > Out of Office Assistant and uncheck the Send Out of Office auto-replies checkbox.