My windows 10 Mail service no longer updates.

This because I made some changes in Outllook to get my Windows Essential live mail to work again.  Although it is no longer to be supported by Microsoft from January 2017.

I still value the Windows Essential mail as I have archived a number of old emails in various folders in it and they appear not to get synchronised to Windows 10 Mail so I can only use them in Windows Essentials live mail at present.

In 2016 the new DeltaSync protocol became the default configuration in Windows Live Mail for Microsoft email accounts (those @outlook, @hotmail, @live, @msn, @windowslive and any other free account with a mailbox at mail.live.com).  

To fix server the error in Windows essentials live mail '3219' 'Unable to send or receive messages to the Outlook account'  a few months back I created a second mail account in my Outlook using IMAP protocol to  re-synchronize my live mail again with mail folders and messages in my Outlook Mail servers.

Extract of instructions followed form link https://answers.microsoft.com/en-us/windowslive/wiki/livemail-email/windows-live-mail-and-outlook-mail/6edb5ba6-f9f2-40fd-80a1-fc23cc6fbfe0

Set up a new IMAP account
 

1. When viewing your message list, press Ctrl-Shift-T to start the Add your email accounts wizard.
2. Enter your email address, password and display name for outgoing messages.
3. Select Manually configure server settings and click Next.
4. For the incoming server, select IMAP from the dropdown.
   For the incoming server address, enter imap-mail.outlook.com and change the port number to 993.
   Select Requires a secure connection (SSL).
   For Authenticate using, select Clear text from the dropdown.
   For Log-on username, enter the full email address.
5. For the outgoing mail server address, enter smtp.live.com and change the port to 587.
   Select Requires a secure connection (SSL) and Requires authentication.
6. Click Next and Finish.