From the feature well: While more than 70,000 people have already signed our Save Windows XP campaign, Microsoft could still halt new XP licenses come June 30, raising the question, what can IT do to get more XP seats? “The answer depends on your licensing arrangement with Microsoft,” Galen Gruman explains. “The short answer for most users, though, is that Microsoft will let people with Vista Business or Ultimate ‘downgrade’ to Windows XP Pro under specific circumstances.” But that’s only the beginning, so here’s InfoWorld’s guide to getting XP licenses after Microsoft pulls the plug. Editor-in-chief Eric Knorr explains in A tale of two Microsofts that, “The point of all this is not to slam Vista. The aim is to keep XP alive, because businesses should be able to choose where they put their resources.”The news beat: Nokia buys Trolltech for its framework used to build interfaces for mobile and embedded devices. Cisco unveils the Nexus datacenter networking platform that, it claims, is designed to meet exploding demands for bandwidth and energy efficiency within datacenters. Progress Software launches Progress Actional 7.1 SOA, a management platform featuring visibility into services and infrastructure. And Microsoft ships the second refresh of Vista SP1, suggesting that the company is drawing close to a final release. Security: Allowing users to execute and install their own software will always lead to viruses, worms and Trojans, Roger Grimes explains. “The greater vision is that all computers run a client-side program, potentially embedded in the operating system, that measures the cryptographic hash of all programs and content being downloaded to the computer.” Control user installs of software. “Doesn’t it make sense for us to help innocent end-users, who just want to do their jobs and have a little fun with their computers, make informed decisions? Because ultimately, we don’t want to stop end-users from installing and running any programs they want — just the bad ones.” Software Development