Following Hancock's plan, development of System 7.5 continued, with several technologies originally slated for Copland being incorporated into the base OS. Apple embarked on a buying campaign, acquiring the rights to various third-party system enhancements and integrating them into the OS. The Extensions Manager, hierarchical Apple menu, collapsing windows, the menu bar clock, and sticky notes—all were developed outside of Apple. Stability and performance were improved by Mac OS 7.6, which dropped the "System" moniker in favor of "Mac OS". Eventually, many features developed for Copland, including the new multithreaded Finder and support for themes (the default Platinum was the only theme included) were rolled into the unreleased beta of Mac OS 7.7, which was instead rebranded and launched as Mac OS 8.