Open source: IBM subpoenas Microsoft, HP and Sun in the SCO case. The orders seek communications between the companies and SCO, as well as documents that could potentially reveal any efforts made to maintain the secrecy of the Unix source code, and information related to royalties paid for Unix.Wireless: Google and EarthLink teamed to create a proposal for citywide Wi-Fi in San Francisco, as have Cisco and IBM. NTP Software’s patent gets a final rejection, and come Friday both companies will learn whether or not an injunction will be enforced against RIM’s BlackBerry sales. Tech leaders call for new uses of U.S. radio spectrum, such as transferring little-used government spectrums to the private sector. Columnists’ corner: Microsoft bolsters ISA’s perimeter role with better Active Directory integration and improved manageability. “Unfortunately, if you’re expecting a security silver bullet or anything else revolutionary out of ISA 2006, you’re in for a disappointment,” writes Oliver Rist in Microsoft builds a beta ISA 2006. “There are several worthwhile features in the new product, and those using it for perimeter or internal boundary defense will certainly want to upgrade.” The news beat: As part of its software-as-a-services strategy, Sun Microsystems scooped up patch management specialist Aduva. And SAP is working on a search engine that will enable users to search structured and unstructured data at the same time via its NetWeaver platform. Technology Industry