Export the rules (Open Outlook | Tools | Rules and Alerts | Options | Export Rules).
Follow the below given steps.

  • Close Outlook and Run MfcMapi. Be very careful while using this powerful tool.
  • Select Session | Logon and Display stores.
  • Select the outlook profile for the user and click OK.
  • Select Mailbox – Right click | Open Store.
  • Expand Root Container.
  • Expand Top of Information Store.
  • Right click Inbox and select “Open Associated Contents Table”
  • Under “Message Class” column, delete all the entries with display name
    • “IPM.Rule.Message” and “IPM.ExtendedRule.Message”

Run Outlook /cleanrules.
Re-open Outlook and Import rules.

–Thanks, Jinesh.