I have about 15-yrs of Yahoo email that I want to sort into folders and I just downloaded the email into Mail in Yosemite. 1. I dragged emails in Mail into folders, though that does not seem to update in Yahoo! web mail 2. I I place emails into folders in Yahoo! webmail, though that does not seem to update in Mail. 3. There is also a Yahoo synchronize option available in the menu options that I have clicked on though I am not sure what that is doing. What is going on? Thanks.