IBM agreed to acquire Vallent Corporation, a supplier of network performance monitoring and service management software for wireless service providers, for an undisclosed sum. Vallent's software helps service providers manage the performance of their network infrastructure through monitoring and reporting problem areas such as dropped calls and traffic bottlenecks. IBM said that adding Vallent's expertise to its Tivoli Software's Netcool portfolio creates a broad set of service assurance capabilities spanning fault, network performance and service...