I've often written about particular instances where Microsoft has bullied competitors; it's a pretty sorry tale. But that story becomes extraordinary when told in detail, and as a sequence of actions whose sole purpose was to drive off competition by any means.
If you're interested in how Microsoft sought to undermine DR-DOS, WordPerfect, Netscape and Java - to say nothing of GNU/Linux - you can find out here in this document from the European Committee for Interoperable Systems (ECIS). As you might guess from the subject matter of the report, this is a bunch of companies who are not overly enamoured of Microsoft:
ECIS has acted as an advocate of interoperability since its inception in 1989. The association believes strongly in the benefits of a competitive and innovative ICT sector, and seeks to support such an environment by actively participating in the promotion of any initiative aimed at favoring interoperability, competition on the merits, innovation, and consumers' interests in the area of information and communication technology.
ECIS’ members include large and smaller information and communications technology hardware and software providers Adobe Systems, Corel, IBM, Nokia, Opera, Oracle, RealNetworks, Red Hat, and Sun Microsystems.
Leaving aside the sad fact that a European organisation can't spell "favouring", it's pretty clear that this is not an objective, balanced picture. But as far as I can tell, it's not untruthful, and its statements are butteressed with references to relevant documents and news items that make it useful for further exploration.