I posted some observations recently. Thanks to all who replied. I was grateful for everyone's interest and preparedness to assist. I the meantime I did reinstall KB3093594 following MS advice of 20 Dec the patch had been fixed. I only use Live Mail for emails, not for calendar. To my surprise at first syncing seemed to work. I have several folders which have sub folders. The sub folders and content did not appear. However, when filing an item into one of the main folders, it became evident in the Move box (i.e. the box that appears when moving or filing an item) that somehow the sub folders had been downloaded, but that the sub folders were just not visible on the main panel. I worked around this and found a way to get the sub folders to be shown and sync with the server faultlessly and the problem has gone. I do not want to describe my own fix as it would become too difficult to describe but if anyone experiences the same problem with the sub folders now showing, please let me know and I will gladly explain how to make that work. Kind regards to all - Philip
Stability Issues with the Windows Live Mail 2012 Update – KB3093594
We have received reports that the Windows Live Mail update- KB KB3093594, is causing stability issues for many of our customers running Windows Live Mail 2012.
Thank you for reporting this issue.
We have identified the root cause and are currently working on a fix that addresses the issue for impacted users on applicable platforms.
Please visit Update for Windows Live Essentials Mail 2012 or this thread for the latest updates.
***Update Dec 20^th^
Sorry for the delay in posting this update.
On Dec 17^th^we rereleased the Windows Live Mail update KB3093594. For users who had previously installed this update and were experiencing a crash when launching the Windows Live Mail app, please download and re-install KB3093594 and this issue should be resolved.
https://support.microsoft.com/kb/3093594
Some users have independently reported a separate issue with sync of mail with attachments that we continue to investigate.
Update 1 February 2016
(posted as Issues 3 under Known issues ... for KB3093594 rev. 6.0)
Some customers have reported other issues with the release on December 17, 2015. This update is no longer being offered while Microsoft investigates these issues further. Server interactions will remain supported during this investigation.
NB: links to http://www.microsoft.com/en-us/download/details.aspx?id=49486 will not work 
Windows for home | Other | Email and communications
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Anonymous
2016-01-11T09:09:20+00:00 -
Anonymous
2016-01-11T00:45:40+00:00 What I found to work for me was the following for Windows 10:
Move all of my messages to storage folders. Uninstall WLM. Restart my PC. Re-install WLM. Do not update with the patch. Move messages back to their original folders, e.g., "Inbox", "Sent", etc.
Good luck.
Microsoft needs to speak up with a definitive answer on WLM/Windows 10/new Outlook Mail! The patch doesn't work on Windows 10!
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Anonymous
2016-01-10T23:52:14+00:00 OK-do we need to uninstall the previous version before updating with the re-built patch?
Please MS, fix this problem, your making a lot of people crazy!
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Anonymous
2016-01-10T21:33:06+00:00 i have uninstalled completely windows live mail, reinstalled it (without the patch) and now all my hotmail accounts cant get synced. what can i do?
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Anonymous
2016-01-09T05:30:54+00:00 Cheers, Noel.