Adding automatic replies to a shared mailbox

• Sign in to https://outlook.office.com/ 
• Click on your name in the upper right hand corner of the browser window and select Open another mailbox
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• Fill in the name of the mailbox in the dialog window and click Open
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• The shared mailbox will open in a new tab
• Click the Settings gear icon in the top right and select View all Outlook Settings and choose Mail > Automatic Replies or search for Automatic Replies
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• From here you can turn on automatic replies with standard options (inside/outside the organization, start time/end time, hyperlinks, formatting, etc.)
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• Once you've set up your automatic reply, be sure to test it from an internal and external account (if applicable)