- Remove reference in Send Recieve Options
- File > Options > Advanced > Send and Recieve : Click Send/Recieve
- Data File account settings and remove the Sharepoint Lists item and the corresponding Data File
- Remove related PST and OBI located in C:\Users\%userprofile%\AppData\Local\Microsoft\Outlook or corresponding folder containing the profile.pst and profile.xmb.obi
- Close and Restart Outlook