Outside software developers were also promised the coding or API's (application programming interfaces) that Windows developers have for programs like Microsoft Office.
This essentially is the reasoning behind Judge Jackson's ruling: that Windows should not be the means by which Microsoft establishes a corresponding monopoly in browsers which, in turn, enables it to limit the potential competitive threat to Windows from the new Java programming language.
If you liked the trial, you'll love the judge's greatest-hits collection of Microsoft skullduggery: binding its Internet Explorer browser into Windows just to beat out Netscape, bullying Intel into staying out of the software market, polluting Sun Microsystems' Java programming language to diminish the competitive threat it posed to Windows, threatening IBM.