I have applied patch KB3093594 to my Windows 7 Ultimate Mail Essentials, bringing it to build 16.4.3563.0918. I have had no problems, except that Checking Mail now takes 1 minute where it used to take about 10 seconds. This happens at startup and when I select Send/Receive.
No one seems to have reported this problem yet - they all had worse problems. I hope my problem also gets resolved when this mess is sorted, without me being forced to move to a later release. I have run a WLM repair but it made no difference. I gather the patch to the patch only applies to Windows 10.
Mike Holland