(S (S (SBAR (BASENP (NN Nine) (NNS months)) (SBAR (IN after) (S (VP (VBG announcing) (NP (BASENP (DT the) (NN interoperability)) (PP (IN between) (NP (PRPD their) (NP (NP (BASENP (JJ instant) (JJ messaging)) (PRN (LRB -LRB-) (BASENP (NN IM)) (RRB -RRB-))) (NNS services))))))))) (COMMA ,) (S (NP (BASENP (NN Internet) (NNS rivals)) (NP (BASENP (NNP Microsoft)) (CC and) (BASENP (NNP Yahoo) (NNP !)))) (VP (VBD began) (NP (NP (NP (BASENP (JJ limited) (JJ public) (NN beta)) (PRN (LRB -LRB-) (ADJP (JJ pre-release)) (RRB -RRB-))) (NN testing)) (PP (IN of) (BASENP (DT the) (NN program))))))) (PERIOD .))