- Take Outlook Rules Backup. Goto Outlook>Rules>Options>Export>RulesFile.rwz
- Then close the Outlook
- Take backup and Delete both NST and OST files from your outlook Folder (C:\Users\%username%\AppData\Local\Microsoft\Outlook)
- Or Run the Bat File to Take backup and delete the Files
@echo offmkdir "C:\Users\%USERNAME%\Desktop\Outlook"copy "C:\Users\%USERNAME%\AppData\Local\Microsoft\Outlook\*.nst" "C:\Users\%USERNAME%\Desktop\Outlook\"copy "C:\Users\%USERNAME%\AppData\Local\Microsoft\Outlook\*.ost" "C:\Users\%USERNAME%\Desktop\Outlook\"
After that please Run this > Then "windows" key + "R" > Run > (type).
Type or paste outlook.exe /cleanrules in the Open field to clear all rules.
Use outlook.exe /cleanserverrules if you know some client rules didn't sync up to the server.
Use outlook.exe /cleanclientrules to keep the server rules.
It will restart the Outlook application and recreate the new fresh OST and NST files.
Then Import the Rules from Outlook..