My question pertains to using Apple Mail on my rMBP (Mid 2012). A long time ago I created a series of Folders within Apple Mail in which to categorize and store messages that I want to save. For example, I have one Folder named "Fence Project", one named "2013 Prius" and about twenty others. Also, I have always used Time Machine to backup all my stuff on a Time Capsule. Now, recently, I sent my notebook to an Apple Repair depot. They found the hard disk was having I/O errors and replaced it. When I got my rMBP back, I simply told the operating system (OS X 10.10) to restore from my Time Machine backup. The process was smooth and painless. OK, let me get to the point. A week later, I discovered that all my saved mail has disappeared. The twenty some folders that I had set up are still there, but in name only. The folders no longer have any content. I'm hoping there is a way to recover those previously saved messages from my backup, but I'm not sure how to do it. If someone can give me step-by-step instructions, I will be very grateful.