Microsoft Lync/ Communicator on Mac OS X lion [closed]

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http://serverfault.com – I am using lync on windows and it works fine. Now i've shifted to mac, installed the lync and try to connect it gives me the following error "Sign-in failed because the password is incorrect or the sign-in name does not exist. If you have forgotten your password, choose Help Topics from the help menu" (HowTos)