msamiga
The short-lived Microsoft BASIC for Amiga was one of the first implementations of structured BASIC by Microsoft. It was released shortly after msmac and both were said to be remarkably similar — as much as we can see what msqb was about to become.
The Microsoft BASIC for the Amiga officially replaced the original ABasiC shipped with the machine, but had only one version, for the Amiga Workbench 1.3.
The "Extras" Amiga disk contained MBASIC, shown by an incon entitled "AmigaBASIC". When running, it would show two windows: