Ok I tried this to get all my "Storage folders" folders/emails over to Windows 10 MAIL.

Move data to Outlook 2016 for Windows

If you choose to use the Outlook 2016 for Windows application, you can move data directly from Windows Live Mail into Outlook 2016. Refer to detailed instructions at Export Windows Live Mail emails, contacts, and calendar data to Outlook to learn how to move emails and contacts to Outlook 2016. Locally stored data can be moved from Windows Live Mail 2012 to Outlook 2016 before or after your Outlook.com account is upgraded.

This process moves your Windows Live Mail directly into your Outlook mail files.

1. Open Microsoft Outlook.
2. Open Windows Live Mail.
3. In the Windows Live Mail window, click the File button and select Exportand then select Email messages.
4. Select Microsoft Exchange as the format and then click Next.
5. (AT this point I get a error message stating: "Either there is no default mail client or the current mail client cannot fulfill the messaging request.Please run Microsoft Outlookand set it as the default mail client.) ??????????????????????????????????????
   
6. You will see a message that all email will be exported to Microsoft Outlook or Microsoft Exchange, click Ok to continue.
7. You can export all email folders or select the appropriate folders that you want to export by using the Select folders option.
8. After you select the appropriate option, click OK and wait for the export process to be completed.
9. When the Export Completedialog box appears, click Finish.
   

Does not work. When I highlight the folders and drag them to MAIL/Storage folders (which I created in W10 MAIL) nothing moves. All I get on the MAIL screen is the red circle for NO SMOKING.