I don't use mail and I opened it up today and clicked continue and it took me to my inbox which I don't have anything because I never set up an account. I thought that maybe I would try to use it but decided not to once it wanted me to enter an account. I wanted to reset it so when mail is opened it would go to the mail message import screen (attached below). I went into my library files and opened the mail folder and moved the V2 and V3 folders to my trash. I reopened mail and it went back to the import screen. Was it okay that I deleted these two folders in the mail folder which is in my library folder? I found a website saying that the V2 folder was an old folder before El Capitan which isn't used anymore and the V3 folder will recreate itself when clicking continue on the mail import screen. Is it okay that I deleted these folders? --- Post Merged, Jan 18, 2016 --- What I kind of mean by my post is that deleting those two files should't affect my Mac because they were in the mail folder under library and should't be part of the operating system?