I am using Win 10 Enterprise in the fast mode - so I get builds faster in advance. This problem happened with the patch after the email warning you got if you do or do not run said patch(s) because WLM was being phased out.
It most likely will work as a general refresh of the bad Patch they issue. See what I did.
I had to reinstall and re add each of the multiple accounts and sync one, reboot and so on.
It worked again until the current build 'Win 10 Insider Preview 11102.rs1_release.160113-1800' around Jan 21, 2015 installed.
I then saw WLM screw up again.
I tried the Visual C++ Redistributable for Visual Studio repairs all the way from 2010 to 2015 SP1 because of my Visual Studio 2015 installed version. This was to help from getting "The program can't start because MSVCR100.dll is missing from your computer. Try reinstalling the program for to fix this problem." but email just would not start.
Outlook 2016 also would not sync very well with a similar set of accounts.
I closed all programs. Then I decided to reinstall again.
Windows Essentials web site:
http://windows.microsoft.com/en-US/windows/essentials
Link should take you to:
http://go.microsoft.com/fwlink/?LinkID=255475
Save and Run:
wlsetup-web.exe
It will not take very long as its already there. Rebooted and it runs again and syncs up.
Now waiting for the WLM patch probably to come around again.
This problem seems to be new C++ or C# related OS dll's being introduced and a benign push to kill WLM in the future, maybe by re-routing to Mail or Outlook. MS does this to almost all products and programs. Since 1993 I have gone through their software top to bottom as a partner.
Neither of these new programs is as powerful as WLM, so I keep at it. Maybe MS will listen, either giving it renewed status in Win10 or fixing the abomination called EDGE, MAIL etc.
Don't get me started on the cr@ppy browser.
Good luck, hope this works for some.
