SOLVED: Outlook Error. The Out Of Office Rules cannot be displayed. The client operation failed.

SOLVED: Error when trying to turn on Automatic Replies (Out of Office) in Outlook. The Out Of Office Rules cannot be displayed. The client operation failed.

Outlook Error. The Out Of Office Rules cannot be displayed. The client operation failed.

You might also get another error "System resources are critically low"

This error is caused by a corrupt inbox rule and can be fixed by deleting the rules using PowerShell

Client-side Outlook rules and Exchange server-side inbox rules

Outlook client-only rules

Client-only rules use conditions or actions that are Outlook features. Client rules only run when you have Outlook open.

Exchange Online server-side rules

Server-side rules use Exchange Online conditions or actions. Server-side rules run on the mailbox in Office 365 and are not dependent on the Outlook client.

Get mailbox inbox rules using PowerShell Get-InboxRule

Get-InboxRule -Mailbox user@domain.com

Copy the rule identity. You'll need this to delete the inbox rule

Remove Outlook inbox rules using PowerShell Remove-InboxRule

Remove one inbox rule using -Identity

# Remove one inbox rule using -Identity
Remove-InboxRule -Mailbox user@domain.com -Identity 1125502695398965249 -Confirm:$false 

Remove all inbox rules for a mailbox

# Remove all inbox rules for a mailbox
Get-InboxRule -Mailbox "user@domain.com" | Remove-InboxRule 

References:

Exchange PowerShell - Get-InboxRule
https://docs.microsoft.com/en-us/powershell/module/exchange/get-inboxrule

Exchange PowerShell - Remove-InboxRule
https://docs.microsoft.com/en-us/powershell/module/exchange/remove-inboxrule

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