Here's the summary for the wikipedia article you mentioned in your comment:

Fear, uncertainty and doubt (often shortened to FUD) is a manipulative propaganda tactic used in sales, marketing, public relations, politics, polling and cults. FUD is generally a strategy to influence perception by disseminating negative and dubious or false information, and is a manifestation of the appeal to fear.

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I thought you meant this:

Microsoft insisted that Internet Explorer (IE) was not a product but a feature that it was allowed to add to Windows, although the DOJ did not agree with this definition.[6]

The government alleged that Microsoft had abused monopoly power on Intel-based personal computers in its handling of operating system and web browser integration.

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

Also in the EU:

Under the commitments approved by the Commission, Microsoft will make available for five years in the European Economic Area (through the Windows Update mechanism) a "Choice Screen" enabling users of Windows XP, Windows Vista and Windows 7 to choose which web browser(s) they want to install in addition to, or instead of, Microsoft's browser Internet Explorer.

https://ec.europa.eu/commission/presscorner/detail/en/IP_09_1941