Rules corrupted in outlook fix
If you are getting this message, there is a quick fix
Go to the online version of outlook https://outlook.office.com and remove the last 3 rules then add them again in the desktop client this should stop the error message.
- Go to settings in the top right of the online Outlook
- Choose the bottom option View all Outlook settings
- Choose Rules from the list
- You can remove rules from here and then add them back in the local version of Outlook.