Much appreciated!
]]>In my scenario I have a hybrid setup, and the user receiving the unwanted notifications was on-premise and the main user was office365. Not sure if this what was causing my issue above.
Giving myself Full Access to the office365 mailbox, and setting the options above I was then able to open my mailbox, and then drill into the office365 user box, and follow your instructions to deleted the invisible delegation…
Which fixed my issue.
Thanks for the article, would have been stumbling around for a while.
]]>Thank you Paul and Pete!
Pete’s idea worked for us too.
(Re-add the Delegate on Calendar folder level and Remove it again.)
Once you’ve done this you can run “Outlook.exe /cleanviews” and then it deletes all the mail rules including the hidden ones.
Obviously if there are legitimate rules export these before doing this, when you import them again it doesn’t import the broken hidden rule.
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