Just upgraded from Win7 to Win10. I had thousands of old saved emails in Windows Mail (the local computer based Win7 compatible mail client, not the webmail). Win10 says my old mail is still there, and SAYS I can import it, and I have the Win10 email app working. But I see no method, and discover none up to now, to import anything into the Win10 email client. Very frustrated as I have two decades of email there (having migrated forward from Outlook Express, to Vista's mail client, and then to Windows Mail under Win7.