Window Mail subfolders

I have been having a problem with Windows Mail (The built in app) that I was hoping the CU update would fix. It didn’t. The problem is the names of subfolders have been replaces with IpmSubFolder. I have tried deleting the account and reinstalling it without success. Seem there is some residual cached info that deleting doesnt remove. Where does Windows Mail store the messages locally

Trying to attach a screenshot