Login to your outlook.com account using a browser. Does it say Outlook.com or Outlook Mail (Preview)?
KB3093594 should only be installed if you have an outlook.com account that has been upgraded to Outlook Mail (Preview).
If you have more than one outlook.com account, you will have to decide if you want the accounts that have not been upgraded to Outlook Mail (Preview) to work or do you want the accounts that have been upgraded to work.
No Outlook Mail (Preview) accounts - do not install KB3093594.
An account has upgraded to Outlook Mail (Preview) - install KB3093594.
Ron,
I have attached below a cropped screen shot of top left corner of my outlook screen accessed via browser.
I run WLM2012 on Win 8.1 64 bit and have just one outlook.com account.
Would you please confirm that I do not need to install KB3093594 and that my outlook.com account will continue to sync in WLM2012 after the changes that you are to make "in a few weeks"?

The email of 11th December appears to have caused widespread chaos ----- will clarification be issued?
Fortunately I unearthed reports of problems with KB and took no action