I do not be able to set Notes as the default email when using Edge in Windows 10.8.5.3 notes being used
Subject: Not supported
Chances are windows 10 uses a different reg key.
That being said install Notes 9 on a windows 10 pc and find the needs reg keys , Export to a reg file and then import on you Notes 8.5.3 pc
Subject: Re: Windows 10 email
Hello Ken!
The information provided by Barry Shapiro is correct!
Probably the cause of the issue is that Notes 8.5.3 is not supported on Windows 10:
IBM Lotus Notes 8.5.3 System Requirements
http://www-01.ibm.com/support/docview.wss?uid=swg27023119
I hope it helps!
Best Regards!
Rodrigo San Vicente
IBM