Mobile workforce tapping unified messaging systemsAging voicemail systems, increasing interest in IP telephony, and a surge in the mobile workforce are driving companies to consider unified messaging - a technology that has long fallen short of industry expectations. Click here for more.VON: Verizon offers VoIP SLAsVerizon announced at Spring 2006 VON Wednesday that it is providing service-level agreements on the quality of its VoIP services. Click here for more.VON: Qwest chief promises not to block Internet traffic, but makes no quality guaranteesQwest will not block any type of traffic traveling through its network as it crosses the Internet, the company's CEO promised at the Spring 2006 VON conference Wednesday, but that came up shy of supporting the notion that all Internet access customers should get the same level of service. Click here for more.New Trojan encrypts data, demands ransomA virus that encrypts documents and demands a ransom to get them back is circulating on the Internet, but at least one security company has released the password needed to recover the files. Click here for more.More than just thresholdsManaging networks is becoming very complex, with many moving parts to watch and larger goals to strive for. Kim Jahnz and others are meeting some success. Read how.Rootkits for VMsIn Gibbsblog, Mark Gibbs points to an alarming security issue for anyone running virtual machines. Click here for details.For news updated throughout the day, go to Network World's NetFlash news page.