Step by Step:

Set an automatic out-of-office reply to let people know that you cannot respond to email messages right away. When you're ready, you can turn off the automatic replies.

Send automatic replies

Select File > Info > Automatic Replies.
Select Send automatic replies.
Select the Only send during this time range checkbox, and then select the dates and Start time and End time.
To set an automatic reply that everyone in your organization will see:
- Select the Inside My Organization tab.
- In the message body, type the message you want people to see.
- Select OK.
Your Out of Office message for people in your organization will turn on, for the dates and times you chose.
To set an automatic reply that people outside your organization will see:
- Select the Outside My Organization tab.
- Select the Auto-reply to people outside my organization checkbox.
- Select either My Contacts only or Anyone outside my organization.
- In the message body, type the message you want people to see.
- Select OK.
Your Out of Office message for people outside your organization will turn on, for the dates and times you chose
Select the Back arrow to return to the Inbox.

Turn off automatic replies

Select File > Info > Automatic Replies.
Select the Do not send automatic replies checkbox.
Select OK.
Select the Back arrow to return to the Inbox.