(S (S (BASENP (DT This)) (VP (VBZ enables) (S (NP (BASENP (NNS users)) (PP (IN of) (BASENP (DT the) (NN two) (NNS services)))) (VP (TO to) (VP (VP (VB communicate) (PP (IN with) (BASENP (DT each) (NN other)))) (S (VP (VBG using) (NP (BASENP (PRPD their) (JJ existing) (NN IM) (NN client)) (COMMA ,) (NP (NP (NP (BASENP (NNP Microsoft) (POS 's)) (BASENP (NNP Windows) (NNP Live) (NNP Messenger))) (PRN (LRB -LRB-) (BASENP (RB formerly) (NNP MSN) (NNP Messenger)) (RRB -RRB-))) (CC and) (NP (BASENP (NNP Yahoo) (NNP !) (NNP Messenger)) (PP (IN with) (BASENP (NNP Voice))))))))))))) (PERIOD .))