This document describes TU Dresden's migration from an outdated Plone 2.1 site to a new Plone 4.3 site to serve as the university's central website. The migration involved moving over 500,000 content objects, customizing Plone to support over 2,500 editors, and optimizing performance for high traffic. Key challenges included the large-scale content migration, user management for a large editorial team, and ensuring consistent performance under heavy usage. Automated testing, monitoring tools, and caching strategies were used to address these challenges during the multi-year migration project.