History
Epi Info has been in development for over 20 years. The first version, Epi Info 1, was originally implemented as an MS-DOS batch file on 5.25" floppy disks and released in 1985. MS-DOS continued to be the only supported operating system until the release of Epi Info 2000, which was written in Microsoft's Visual Basic and became the first Windows-compatible version. The last MS-DOS version was Epi Info 6.04d released in January 2001.
Epi Info 2000 changed the way data was stored by adopting the Microsoft Access database format, rather than continuing to use the plain-text file format from the MS-DOS versions. Following the release of Epi Info 2000 was Epi Info 2002, then Epi Info version 3.0, and finally the open-source Epi Info 7. The 7 series is the presently maintained Epi Info product line. Note that Epi Info 3 for Windows is different than Epi Info 3 for MS-DOS even though they share the same version number.
Windows Vista was officially supported with version 3.5.1, released on August 13, 2008.
The next iteration of the Epi Info series, Epi Info 7, was made open source on November 13, 2008 when its source code was uploaded to Codeplex for the first time.
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