You can activate out-of-office notes for another user or user group as long as you are authorised to do so as a  delegate (Authorise a delegate for yourself or others)

1. Go to the  Communication tab in the function bar and select  Out-of-office reply.
2. Select the user you want from the drop-down list   On behalf of other user.
3. If required, adjust the text or select a text template from the drop-down menu  Out-of-office reply.
4. In the toolbar, click on the  Inactive icon to change the status to  Active.
5.  Save your changes.