Question about Outlook Express

I tried windows 10 once before. It was fine I guess except that my windows live mail was no longer "compatible" to which the pre-install said nothing about and compatibility issue with it. So, now it didn't work. Couldn't open it, transfer, update access...etc any longer. went through the entire process re-intall windows 7, that was fun. So now after many months your telling me to upgrade or else. Have you fixed the problem? If not then please explain someone why I would want to change to 10? Don't  go on and on about all the tech specifics, I get it. However, I would like to know if the windows essential that is connected to windows live mail will now work with Windows 10. Need to hear from someone who has dealt with this, because were not all DBA's out here, lol.

My Live Mail stopped receiving emails a few months ago although Outlook continues to work fine. My Live Mail was set up by the phone company provider. It does not appear to be an internet site but seems to be a program on my computer, in the upper left corner it says Inbox - Windows Live Mail. I got used to Live Mail and would prefer to continue to use it instead of Outlook.

The server URL for my Live Mail is DeltaSync so I suspect this is the problem.

There seems to be no synchronization between my Outlook.com, Office Outlook, and my Live Mail.

Windows Live Essentials says I am using the current version.

Can I update the server URL to make my old Live Mail receive mail?

My email link is working fine, but when my wife logs in  as a different user, her email icon has dropped off the start page.  Its been working fine for months, but now, although mail is still listed under most used, and both her email addresses are listed in settings, there is no icon to click! I have added her address to my log in and she can access emails from there but thats hardly ideal.  Suggestions please!

BTW, this is actually her typing on my sign in.