The MUI for AmigaOS development team is proud to announce the immediate release of version 5.0-2017R1 of the Magic User Interface for AmigaOS4/PPC and AmigaOS3/m68k. MUI is the abbreviation of Magic User Interface, an object-oriented BOOPSI-driven user interface framework for AmigaOS-based operating systems. It features a flexible user interface where end-users can define the Look&Feel of applications using MUI in high detail. Beside this end-user flexibility MUI comes with a wide variety of so-called Custom Classes which developers using MUI can use in their applications and which provide additional functionality (e.g. such as a full-fledged text editor). This third-party custom class functionality as well as the high user flexibility in defining the Look&Feel of a MUI applications makes MUI the most advanced user interface framework for AmigaOS computer systems today. Please note that MUI5 for AmigaOS3/m68k is definitely targeted at powerful systems with a fast CPU and a fast graphic board. Although it is still possible to run this release on a real 68k machine an emulation like WinUAE is very highly recommended. Also colormapped screens with 256 colors at most are still supported, but MUI5 makes heavy use of fancy truecolor images and effects which cannot be provided on colormapped screens with the full range of possibilities.