I use the mechanism Based on SiteList for Enterprise Mode to automatically redirect to Internet Explorer for sites that cannot run in Microsoft Edge. (Windows 10 with Edge as default browser)
Everything works fine after I understood the meaning of the new attribute "doNotTransition" in the SiteList.
Problem: For sites redirected to Internet Explorer there is always an Edge Window presented. Checking “Automatically open this site with Internet Explorer in the future “ does not prevent Edge to be opened in the background each time pointing to a link that
is set to redirect to IE. (IE is also opened and with correct site presented! )
I followed instructions here:
https://blogs.windows.com/msedgedev/2015/08/26/how-microsoft-edge-and-internet-explorer-11-on-windows-10-work-better-together-in-the-enterprise/