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During development, Apple was contacted by Dell to license distribution of Rhapsody on their PCs, but declined due to inability to get all manufactured computers dual-booted with Rhapsody and Windows for customer preference (reducing Dell's royalty costs to Apple). Rhapsody notably included an emulator under the name of "Blue Box" that would run an emulated session of a classic Mac OS 8 system to run classic applications, while native applications were ran under NeXTSTEP's object libraries known as the "Yellow Box". Two developer releases of Rhapsody were released during the time, with both builds being compatible with PowerPC and x86 computers. Rhapsody was intended to release to developers in late 1997 and see public release a year later. This process would be related to Apple's previous Copland project. Rhapsody was originally intended to offering a migration path to a new generation of Mac-based operating systems while retaining backward compatibility with classic Mac OS software. Rhapsody represented the fifth major version of the UNIX-based system NeXTSTEP following Apple's acquisition of NeXT. The Rhapsody project was announced in January 1997 at MacWorld Expo and was demonstrated at the 1997 Worldwide Developers Conference (WWDC).
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