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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 
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
After several attempts of downloading the latest update KB3093594 and reboots. I am Not able to update my Windows Live Mail 2012 program emails since around December 11, 2015. I get the following error message:
Server Error:0x80004005 and Windows Live Mail Error ID: 0x80004005
I am continuing to investigate. Please advise.
I had a problem only with my calendar not updating (I guess I was lucky) and the update did fix hat so now everything works fine. I have 4 accounts that WLM downloads and all work. Have you tried contacting MS directly? I know they can be a real pain in the a** but maybe they can help. By the way what email services do you use? I use Time Warner for 2 accounts (twc.com), Frontier (frontier.com) which is actually Yahoo mail and Gmail. I believe MS has said that some services won't work (Hotmail, etc).
It's the MS outlook live mail that does not work. All non MS email accounts work. MS failed to update all their mail servers at the same time. The KB update caused the failure for users that still on the mail servers that have not been updated.
The Calendar functions and sync with Outlook.com are still not working properly. The new events in my WLM PC Calendar do not get synced to the Outlook.com Calendar, so that I haven't gotten notifications for any events I created after applying the patch. The new events in my WLM Calendar eventually (I don't know how long it takes) get saved to the Calendar on my PC - i.e., if I shut down WLM and restart it and I haven't waited long enough, recently entered new events disappear and have to be re-entered.
The Calendar functions and sync with Outlook.com are still not working properly. The new events in my WLM PC Calendar do not get synced to the Outlook.com Calendar, so that I haven't gotten notifications for any events I created after applying the patch. The new events in my WLM Calendar eventually (I don't know how long it takes) get saved to the Calendar on my PC - i.e., if I shut down WLM and restart it and I haven't waited long enough, recently entered new events disappear and have to be re-entered.
