Outlook Program:
Select File > Automatic Replies.
Note: If you don't see the Automatic Replies button, follow the steps to use rules to send an out of office message.
Select Send automatic replies.
If you don't want the messages to go out right away, select Only send during this time range.
Choose the dates and times you'd like to set your automatic reply for.
Type in a message. You can format the text using the tool bar, or cut and paste text you've formatted, including hyperlinked text.
Select OK.
For Outlook Web Access:
Select Settings (Gear Icon in top right) > search "Automatic Replies" in the search bar and select
Select "Turn on automatic replies"
If you don't want the messages to go out right away, select Only send during this time range.
Choose the dates and times you'd like to set your automatic reply for.
Type in a message. You can format the text using the tool bar, or cut and paste text you've formatted, including hyperlinked text.
Select OK.