Regarding notes.ini parameter "NOTES_PLUGIN_DEFAULT_BROWSER" for ICAA/HCAA, it supports the following value currently.
(For Microsoft Internet Explorer)
However, it does not support Microsoft Edge (both Chrome-based and non Chrome-based).
Especially, in case of MS IE, Customers new Windows 10 PC will not have MS IE installed on it, because MS IE will be end of support in the not-too-distant future.
So, "NOTES_PLUGIN_DEFAULT_BROWSER" should support Microsoft Edge.