When I get an important email on my yahoo account, I save it in a folder. The folders are still listed after the Windows 10 update on June 13, but when I click on the folder name - it reports that the folder is empty. I just looked at many of the folders last week and they were all holding my data. Now I have no data in any folder. WHY My files are all okay. The folders on my wifes email are still intact. The folders in my two accounts are reporting they are empty.