Setting Out-of-Office Assistant
1. Click on File > Info > Automatic Replies

2. Select Send automatic replies to begin.
You can tick on “Only send during this time range” to specify the duration when you want the auto-reply to be sent. Upon the specified End time, the auto-reply will stop automatically.
Type your message and click OK.

3. If you want to send the auto-reply to external senders, click on Outside My Organization and tick on “Auto-reply to people outside my organisation”.
Type your message and click OK.
If you select the option “My Contacts only”, this means that only external senders which are already in your Address Book will get the auto-reply.