Hi there,
I noticed this thread talks about the thing I would love to have.
http://social.technet.microsoft.com/Forums/en-US/4192a34b-d399-4aa4-8ee2-dc6a327cb952/server-error-in-remote-application-using-upn-to-log-on?forum=smallbusinessserver
I understand the SBS is designed for smaller, non-it specific, however most of the places that you do install are also limited so telling the when you use the RWA you use the "username" but when you log into Office365, you use your email address, it would be nice to have them all the same.
I see that from here you are able to modify the RDWeb.
http://msfreaks.wordpress.com/2013/12/29/step-by-step-customizing-rd-web-access-2012-r2/
But I understand that the Essentials is an out of the box solution, so maybe nobody has wanted to try or to fix.
The first post mentions about a "Error" with RWA in 2011 and they still haven't found something for this? As they did mention about looking into it, however, no solution, so I can't be the only person asking for this feature of consistency, as I know there are other out there.
Does anyone have any suggestion on how to enable this? I swear that my Server Essentials 2012 this worked, as I tested it, so not sure what happen in R2.
Kevin