In that case, "On September 18, 1998, believing that certain statements from Netscape employees reported in Lessons offered succor for its defense, Microsoft subpoenaed the professors' notes, tape recordings and transcripts of interviews, and correspondence with interview subjects. "
https://caselaw.findlaw.com/us-1st-circuit/1179769.html
In that case, "On September 18, 1998, believing that certain statements from Netscape employees reported in Lessons offered succor for its defense, Microsoft subpoenaed the professors' notes, tape recordings and transcripts of interviews, and correspondence with interview subjects. " https://caselaw.findlaw.com/us-1st-circuit/1179769.html
Here is Google subpoenaing Microsoft, https://www.business-standard.com/article/technology/microso...
AMD subpoenaing Microsoft, https://www.networkcomputing.com/data-centers/amd-subpoenas-...
Here is a judge standing up an squashing a Microsoft subpoena of Oracle and Sun , https://www.networkworld.com/article/2310247/microsoft-fails...
Oil Price Information Service, a Oil Industry trade publication was subponeaded in a price fixing case to hand over unpublished information, https://www.competitionpolicyinternational.com/oil-industry-...