Microsoft has released Virtual PC for Mac 6.1.1, the latest version of the popular PC emulation software. This update addresses security issues and bugs related to running upcoming Windows XP Professional service packs. At Macworld Expo last month, Microsoft said it plans to release Virtual PC 7.0 in the first half of 2004. Version 7.0 will offer performance improvements, user interface enhancements and compatibility with the Power Mac G5.