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Hi Riordan It is not feasible to do that from the Exchange admin portal. However, you can achieve it by using PowerShell commands.
Below are the steps: 1. Connect to Exchange Online using remote PowerShell. Refer to the article below: 2. If you want to configure Automatic Replies for someone’s mailbox(e.g. Tony) to be set between the specified start and end dates and include an internal message, please run the following command: Set-MailboxAutoReplyConfiguration -Identity tony -AutoReplyState Scheduled -StartTime '7/10/2012 08:00:00' -EndTime '7/15/2012 17:00:00' -InternalMessage 'Internal auto-reply message' 3. If you want to configure Automatic Replies for someone’s mailbox(e.g. Tony) to be sent and include an internal and an external message, please run the following command: Set-MailboxAutoReplyConfiguration -Identity tony -AutoReplyState Enabled -InternalMessage 'Internal auto-reply message.' -ExternalMessage 'External auto-reply message.' Please contact me if you run into any problems when performing the steps above.
Best Regards, Gary Zhu.
If you wish to set an automatic reply on an Office 365 shared mailbox – to provide information or as an out-of-office message – you must currently do so through the Outlook Web App (OWA). Go to the shared mailbox in OWA (see: ).
In the shared mailbox, go to the top right and click the gears icon. Select “Options” from the dropdown menu. Scroll through the menu on the left to the bottom and select “Other.” On the screen that appears, click “Go to the earlier version” to be redirected. (click to enlarge image) In the earlier version, you should land on a page with shortcuts, the first of which should be “Set up an automatic reply message.” If you do not, go to the “organize email” section in the left menu, and then choose “automatic replies” from the top tabs. Select the “Send automatic replies” button and set your automatic reply. Then click the Save button to finish.
If you wish to remove the automatic reply manually – instead of setting a time period, or before the set time period is up – simply follow these instructions again and select the “Don’t send automatic replies” button.