I installed Windows 10 recently. When I discovered it was not compatible with my company software and local MLS software with my Realtors Association, I used the option provided by MSN to uninstall it and go back to Windows 7 and Live Mail. Since then, my emails are deleting after about 30 days. The sender and subject line are there, but when I try to open it, the body of the message shows "cannot find message". This just started after the uninstall of Windows 10. How do I stop this from happening and, if possible, how do I recover the lost messages?

Thanks