office communicator error cannot sign in because the server is temporarily unavailable if the problem persists , contact system administrator
if any have guide line so plz send or reply me
I would recommend starting with the following: http://support.microsoft.com/kb/2368074
If that doesn't work, either post up, email me, or open a support case with BPOS support.
Have a great day,
Dan
www.insecurityinc.info