To back up Windows Live Mail data, you can export messages or copy files from your computer. This tutorial shows where Windows Live Mail account data is stored on a Windows Vista, 7, 8, 8.1 and 10 computer.
Path to Windows Live Mail files on the hard drive
1. Close Windows Live Mail.
2. Open a file explorer and browse the hard drive where Windows is installed in the path:
C: Users USERNAME AppData Local Microsoft Windows Live Mail
If the AppData folder is not visible, you must either display the hidden files or type it by hand in the address bar at the top.
3. The folders show the details of each email account.