New
#1
This is the issue: MS is performing this upgrade in waves of Outlook.com accounts. Unfortunately, they jumped too soon to send out this message, and applying it before your account is upgraded will crash WLM during calendar synch.
Here's the word (courtesy of Ron Sommer MVP):
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.