FUD（英语：Fear, Uncertainty, Doubt，意思为惧、惑、疑）最早指IBM销售人员对客户灌输阿姆达尔公司和其他竞争对手产品的负面观念，在顾客的头脑中注入疑惑与惧怕，使顾客误以为除了该公司的产品外，他们别无其他选择。
- Jones, Pamela. Exhibits to Microsoft's Cross Motion for Summary Judgment in Novell WordPerfect Case. Groklaw. 2009-11-23 [2011-10-22]. （原始内容存档于2013-08-21）.
- Burt, Thomas W.; Sparks, Bryan W. Settlement agreement - Microsoft Corporation and Caldera, Inc. reach agreement to settle antitrust lawsuit (PDF) (Court document). 2000-01-07 [2018-08-03]. Case 1:05-cv-01087-JFM, Document 104-8, Filed 2009-11-13; NOV00107061-NOV00107071; LT2288-LT2298; Lan12S311263739.1; Exhibit A. （原始内容存档 (PDF)于2017-07-04）.
[…] Microsoft will pay to Caldera, by wire transfer in accordance with written instructions provided by Caldera, the amount of two hundred eighty million dollars ($280,000,000), as full settlement of all claims or potential claims covered by this agreement […](NB. This document of the Caldera v. Microsoft case was an exhibit in the later Comes v. Microsoft case.)
- Wallis, Richard J.; Aeschbacher, Steven J.; Bettilyon, Mark M.; Webb, Jr., G. Stewar; Tulchin, David B.; Holley, Steven L. Microsoft's memorandum in opposition to Novell's renewed motion for summary judgement on Microsoft's affirmative defenses and in support of Microsoft's cross-motion for summary judgement (PDF) (Court document). United States District Court, District of Maryland: 16. 2009-11-13 [2018-08-03]. Novell, Inc. v. Microsoft Corporation, Civil Action No. JFM-05-1087. （原始内容存档 (PDF)于2019-05-24）.
[…] Microsoft paid $280 million to Caldera to settle the case […]
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