Microsoft Sued by DOJ for Antitrust

On May 18, 1998, the U.S. Justice Department and 20 state attorneys general filed an antitrust suit against Microsoft — the most powerful tech company in America then, accused of using monopoly power to bully collaborators and squelch competitors, most famously Netscape.

Microsoft was ruled an unlawful monopolist in 2000 for using its stranglehold on the PC market with its Windows operating system to cripple competitors, such as Netscape's Navigator Web browser. A court initially ordered the company to be split up. That breakup order was later overturned on appeal, and the government and Microsoft entered into a consent decree in 2002, focusing on behavioral and technical remedies rather than a corporate breakup — requiring Microsoft to share its APIs with third-party developers and prohibiting retaliation against PC makers who installed rival software.

Microsoft endured 21 years of antitrust battles, but the consent decree's restraints arguably helped its rivals more than any structural breakup would have. The cautious, compliance-minded Microsoft of the 2000s ceded the search market to Google, the mobile market to Apple and Android, and social media to Facebook. You can argue that Microsoft lost its innovation edge due to its size, but the settlement's shadow may have a more lasting impact.

Fast forwarding to the latest decade, when the new tech giants like Apple, Google, Meta faced similar antitrust threats, their fates have been quite different.

The DOJ modeled its search engine antitrust complaint against Google, as well as proposed remedies, on the Microsoft case — essentially saying "if we can make our case look like Microsoft, we can win too." But the results have been mixed at best.

The liability finding was decisive: Judge Mehta determined in August 2024 that Google had illegally monopolized the search market through exclusive contracts with major smartphone manufacturers, finding that deals with companies including Apple and Samsung — for which Google paid more than $20 billion annually — effectively prevented competing search engines from accessing crucial distribution channels.

But the remedy was where it diverged sharply from Microsoft. The DOJ pushed hard for structural remedies — forcing Google to spin off or sell assets like Chrome or Android. Judge Mehta rejected those options. The key remedy: Google must share some of its raw search interaction data, but was spared from having to share its actual algorithms.

In March 2024, the DOJ also filed an antitrust lawsuit against Apple alleging it illegally maintains a monopoly in the smartphone market, claiming Apple uses its control over the iPhone ecosystem to stifle competition. Apple's motion to dismiss was denied in June 2025, but the case is expected to take years. The case resembles Microsoft — dominant platform, bundling accusations, ecosystem lock-in — but the case is more complex given the App Store, payment systems, and hardware-software integration, and Apple can argue it is facing fierce competition from all angles.

Why are antitrust cases harder these days? Today's tech giants are multi-market conglomerates simultaneously dominant in search, advertising, social, cloud, mobile, and e-commerce. By contrast, Microsoft controlled ~90% of PC operating systems — a single, well-defined market with clear victims (Netscape) at that time when Internet access was only through PCs. Defining the market itself today has become the first legal battleground in an antitrust case.

Judges also render remedies based on other factors. Microsoft faced a real (if ultimately reversed) breakup order. The DOJ sought to partially break up Google through a forced sale of Chrome, an end to its exclusivity deal with Apple, and handover of search data to competitors. Yet in the end, only the latter is being required — with the judge largely accepting the company's arguments and leaving discipline to "market forces" in the form of rising AI technology. Because with Microsoft in its decade, the relevant technology moved slowly enough for courts to keep up. With Google, Judge Mehta explicitly noted that the rise of generative AI — such as ChatGPT and Perplexity — factors into the calculus, making overly drastic remedies more dangerous and unnecessary. The court essentially argued the market was disrupting itself in real time, making hardline remedy less effective.

The moral of the story: antitrust threat should not deter companies from continuing innovating. The tech world we live in is more complex, more intertwined, and more fast paced than 30 years ago. Microsoft has learned its lesson.