Still, if you plan on sticking it out, you can go ahead and grab the required update from Microsoft.
You were using Windows Live Mail (WLM) desktop email client program to access your Hotmail, Outlook, Windows Live, MSN or any other Microsoft account's email.
Microsoft goes on to recommend that users on Windows 8, 8.1, and 10 go ahead and make the switch to the built-in Mail app on each OS.
And honestly, that's not a bad idea considering support for Windows Live Mail 2012 is most likely waning.
Basically the bottomline is that Windows Live Mail email client can't sync Microsoft account emails any more.
It'll show various error messages such as "Unable to send or receive messages for the account", "An error occurred in looking up the user's information in mserv", etc.
You might be knowing that EAS protocol is also used by Microsoft Outlook program.
When Microsoft planned to discontinue Delta Sync protocol, the company decided to implement Exchange Active Sync (EAS) protocol support in Windows Live Mail program so that it can sync emails without any problem using new synchronization protocol.
Now you can't sync your Microsoft account emails using Windows Live Mail program.
You were not using Windows Live Mail application to sync your Microsoft account emails but recently you decided to add your Microsoft account (hotmail, outlook, msn, etc) into WLM program but its unable to sync emails and shows error messages.
If you add your Microsoft account using POP3 or IMAP protocol in WLM, it'll sync emails without any problem.
So if you are unable to sync your Microsoft account emails in WLM program, you just need to remove existing Microsoft account from Windows Live Mail program and then re-add it using IMAP or POP3 protocols. On next screen, select IMAP from "Server type" drop-down list and enter required incoming and outgoing server addresses and port numbers for your Outlook email account as given in following article: Following screenshot also shows the required information: Don't forget to type your correct email address in "Logon user name" field. Now click on Next button and it'll add your email account successfully.
Everything was working fine and WLM was properly syncing your account emails without any problem.