Hi Jean,
Thank you for posting your query in Microsoft Community.
From the issue description, I understand you want to retrieve your emails and folders in Windows Live Mail.
If you are using Microsoft account in Windows Live mail, you can follow the Microsoft article below to restore deleted email messages.
http://windows.microsoft.com/en-us/windows/outlook/recover-deleted-messages
If you are using 3^rd^ party email in Windows Live Mail 2012, you can follow the steps below.
Step1:How to recover deleted emails and folders.
1. Open and Explorer window (Click Start => Computer) and then navigate to this path: C:\Users\username\AppData\Local\Microsoft. The "username" folder there represents your Windows user name. Also, if you are unable to see the AppData folder inside your "username" folder, this simply means that you are unable to see hidden folders since the AppData folder is a hidden folder. You need to "show" hidden folders, files and drives so that you will be able to follow the remaining procedures.
2. When you are in the "Microsoft" folder, please locate Windows Live Mail folder there.
3. When found, COPY the Windows Live Mail. Then paste it in your desktop screen or any location you prefer, like your My Documents. This is to backup the folder.
4. When copying is done, right click on the Windows Live Mail folder then click on "Restore previous versions”.
5. In the dialog box that opens, please choose the date of the restore point that you want to restore your mails from. Click on that restore item then click on the Restore button.
6. In the confirmation prompt that shows up, click on Restore button to confirm the restore operation.
7. Then the restore process will proceed.
8. Please give it some time until the operation is done. Then click the OK button
9. Now close all windows and other programs. Then open your Windows Live Mail and all your emails shall be restored to the date that you selected.
Let us know the status of the issue.