 Earlier versions of AE Pro were distributed by Roger Wagner of Southwestern Data Systems, and later by United Software Industries (founded by Mark Robbins, Bill Blue and others).Greg Schaefer converted AE Pro from Apple DOS 3.3 to Apple ProDOS in an afternoon, and received US$5000 for his efforts.In 1984 Bill Blue and Joe Holt ported AE Pro to MS-DOS and 8086 assembly language.