Mainly the US anti-trust case <
http://www.justice.gov/atr/cases/f3800/msjudgex.htm>. Example:
> At the same time, Compaq removed the Internet Explorer icon from the desktop of its Presarios and replaced it with a single icon [for Navigator]
>When Microsoft learned of Compaq's plans for the Presario, it informed Compaq that it considered the removal of the MSN and Internet Explorer icons to be a violation of the OPK process by which Compaq had previously agreed to abide. [...] Finally, after months of unsuccessful importunity, Microsoft sent Compaq a letter on May 31, 1996, stating its intention to terminate Compaq's license for Windows 95 if Compaq did not restore the MSN and Internet Explorer icons to their original positions. Compaq's executives opined that their firm could not continue in business for long without a license for Windows, so in June Compaq restored the MSN and IE icons to the Presario desktop.
