Lync Communicator Mobile wont login

Error Message

Server unavailable at this time


On the Sign In page you enter your SIP Login name and password. However you also need to go to More Details (ios and WM7)Options (Android) and add your user name. 

I have found that the username for WM7 needs to be DomainUser Name, although this format works on Android and ios simpoly adding the user name also works