GARTNER SYMPOSIUM/ITxpo, ORLANDO, Fla., October 20, 2003 -- InstallShield® Software Corporation, the acknowledged leader in software installation, packaging, and deployment solutions, today announced AdminStudio® 5.5, the most complete tool suite for application packaging, customization, conflict resolution and automated quality assurance. AdminStudio 5.5 premieres today at the Gartner Symposium/ITxpo 2003, and will be available by December, 2003.