I am having this exact issue ... I'm using Windows 7 and every update has been installed.
Which one is that? This thread deals with 'stability issues' - that's a euphemism for program crashes ("... stopped working and needs to close ," for example). The problem only happened on Windows 10 after installing the first release of KB3093594 and it went away with the next release on 17 December. If Windows Live Mail 2012 is crashing on start-up after installing the latest version of KB3093594 on Windows 7, you should say so. We've only seen a couple of cases so far.
I've ... reinstalled Windows Live Mail,
This will probably have removed KB3093594. I haven't seen any confirmation that if the update is installed by Microsoft Update, it will survive a re-installation of Windows Essentials. To find out whether you still have the update or not, in Windows Live Mail press Alt-F B to see the About screen. What is the build given there?
If you're not seeing program crashes, but just synchronization errors, then how to proceed depends on whether the account concerned has been upgraded to Outlook Mail or not. To find out, sign in to the account at mail.live.com. Which of these do you see in the top left-hand corner?
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