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Fix issues wth Out of Office (OOF) rules on Microsoft 365

Sometimes the Out of Office auto-responder can get confused and it won't send replies correctly, or even at all. Sometimes it sends an old reply instead of t...

Sometimes the Out of Office auto-responder can get confused and it won’t send replies correctly, or even at all. Sometimes it sends an old reply instead of the new one the person has entered.

You can delete these rules from the mailbox in Microsoft 365 via PowerShell with the following sequence of commands:

Connect-ExchangeOnline -ShowBanner:$false
Set-MailboxAutoReplyConfiguration -Identity user@example.com.au -AutoReplyState Disabled
Set-MailboxAutoReplyConfiguration -Identity user@example.com.au -AutoReplyState Enabled
Get-InboxRule -Mailbox user@example.com.au -IncludeHidden
Remove-InboxRule -mailbox user@example.com.au -Identity "Microsoft.Exchange.OOF.InternalSenders.Global"
Remove-InboxRule -mailbox user@example.com.au -Identity "Microsoft.Exchange.OOF.AllExternalSenders.Global"

There may be only one of the mailbox rules listed - not all mailboxes will have both. Just delete each one as appropriate.

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