It was the Clinton administration that started regulatory proceedings against Microsoft, but it was GW Bush that was president during the conclusion of the case. And, true to form:

> The Department of Justice, now under Bush administration attorney general John Ashcroft, announced on September 6, 2001, that it was no longer seeking to break up Microsoft and would instead seek a lesser antitrust penalty

https://en.wikipedia.org/wiki/United_States_v._Microsoft_Cor...