Correct Grammar 2.0 for Windows Released in 1991 by Houghton Mifflin Company For Windows 3.0 Image quality: Unmodified Correct Grammar is a grammar checking and analysis tool for DOS. Correct Grammar incorporates technology from the Houghton Mifflin CorrectText system. This version is designed for Windows 3.0. Note: It seems to run in Windows 3.0 real mode. Archive includes two 3.5" 1.44mb floppy disk images.