This is long shot but see if something possible...
I have web app hosted on server using asp.net authentication
This works ok on say "mydomain1.com"
However the company (100 people) want to use app without having different account to their Windows server account, which they use to login to Lync...
So what they want:
If logged in to Lync on my domain2.com domain (logged in to Windows )
Then do not need to use asp.net account login, the pages simply work without logging in
If not logged in to Lync e.g. if at home or different pc, login using asp.net account
Mydomain1.com and mydomain2.com are in no way linked and cannot be