After the downloaded Windows 10, when I open the email I get an error message:  Unable to send or receive messages.  Server Error 3204  Server htpps://mail.service.live.com/Delta Sync v2.0.0/Sync.aspx Windows Live Mail  Error ID: OX8DE20003

I am now on my fourth day.  I tried to link the Hotmail account to the new Outlook account, hoping the undelivered messages would go into it.  No luck - I am getting new messages in the Hotmail account with the Outlook address.