News item: leaked Windows code contained profanities.
When I worked at Microsoft, there were indeed profanities in Windows NT code. However they were quickly removed once we created a searchable content index of the source code. The managers would play with the contex index by querying for all the standard cuss words. The funny thing is that they didn't realize we were logging all the queries. We would later go through the logs and chuckle at Dave Cutler's or Jim Allchin's queries. In a few weeks all the profanities disappeared.
So either Microsoft Systems turned off the content index or, more likely, the leakers added their own comments.