I was able to configure TMG server with Secure LDAP for Exchange 2010 Web Access publish.
Edge server and TMG both server roles running on the same server. both services are working fine now.
Now customer wants to change Log in filed for just user name.
Currently its appearing as "Domain\user name: " . I want to change it for " User Name" .
I was able to change it on Client access server easily. Still no clue for how to do with TMG server.
Any advice highly appreciate.