In the early ‘90s, Netscape ruled the world with Navigator, an internet browser that was easy and accessible, empowering folks to get online. For $49 — unless you had a free version provided by your ISP — the nascent internet was at your fingertips. Microsoft had slept on the web and belatedly came to the conclusion that it was a threat to Windows’ global dominance. So, far later than it should, the company decided that it needed to take ownership of what we did online.

Microsoft drew, uh, inspiration from Netscape, licensing code from the browser Netscape was based on (Mosaic) and set to work. At the start, Internet Explorer wasn’t as good as Navigator. It didn’t play well with Java and was riddled with bugs. But it also had the virtue of being free, as Microsoft began giving it away with Windows updates and eventually baking it into the OS itself. This set an expectation that nobody need ever pay for a web browser ever again.

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In 1995, Netscape Navigator reportedly held 70 and 80 percent of the US web browser market. However, by 1998, Internet Explorer had supplanted Netscape on the back of this free giveaway. But it wasn’t just the public who had noticed: So had Bill Clinton’s Department of Justice, who had been lobbied by Netscape about what was going on.

That same year, the Department of Justice launched an antitrust action, investigating whether Microsoft had violated antitrust laws. They contended that bundling Internet Explorer with the OS, and giving it away for free, violated the first two sections of the Sherman Act. It didn’t go well for Microsoft. CEO Bill Gates was roasted in depositions by (future star lawyer) David Boies. The judge agreed, and declared in his judgment that Microsoft wasn’t just behaving anti-competitively, it also needed to be broken up.

In his decision, Judge Thomas P. Jackson said that Microsoft was attempting to hold onto a monopoly through “anticompetitive means.” He added that the company should be split into two: One building the Windows operating system and another responsible for other software. But rather than motion for a hearing to further examine if a break-up was appropriate, he just demanded it. 

This immediately gave Microsoft a point of law on which to base an appeal, and Jackson’s decision would be examined in great detail by The Ringer. Department of Justice economist Daniel Rubinfeld said that his colleagues “assumed that there would be a follow-on set of hearings,” to hash out the merits of breaking up Microsoft. Then acting attorney-general Doug Melamed added that Jackson’s ruling implied that he was “tired of the case” in a way that was “irresponsible.” 

Microsoft would eventually settle with the Department of Justice, establishing a three-person independent committee would have the power to scrutinize Microsoft’s business. The company also had to develop an internal antitrust compliance policy to ensure this didn’t happen again. But it was a case of too little, too late for Netscape, which was bought by Aol (now owned by Verizon Media, Engadget’s parent company) just as its market share began falling. By 2004, Internet Explorer had around 90 percent of the market, Navigator had faded to single digits. Microsoft had won. 

And then, just as soon as it had, it began to lose. Firefox had been slowly eating small chunks of Microsoft’s market share, and then in 2008, Google’s Chrome turned up. The two browsers between them were breaths of fresh air compared to Internet Explorer, with its numerous flaws. Its lack of standards compliance, persistent faults and the ease at which it would crash meant power users hated it. 

There are a number of market share sources, each with slightly different statistics, but the trend is unmistakable. From owning the market in 2004, Microsoft’s dominance was eroded pretty much constantly. By 2013, Internet Explorer had less than 30 percent of the market, with the spoils being shared by Chrome, Firefox and Apple’s Safari, as iOS grew into the juggernaut it is today. Internet Explorer wound up a joke that even Microsoft had to laugh at.

Microsoft would, eventually, replace Internet Explorer with Edge, a new browser that has since been redeveloped to use Google’s Chromium engine. It fixes many of the problems that people ever had with its predecessor.

The brush with the government was a chastening experience for Microsoft and one that may have dented its ambitions. Senator Richard Blumenthal and academic Tim Wu wrote in The New York Times that the case forced Microsoft to be more cautious. “Imagine a world in which Microsoft had been allowed to monopolize the browser business,” they wrote, “Microsoft would have controlled the future of the web.”

They argued that Microsoft, even with a more friendly Department of Justice under G.W. Bush, was far less aggressive. And in doing so, allowed a space into which Google, Facebook, Amazon and others could grow on their own terms. And yes, they added, while it was ironic that those companies were now in the line of fire, it was evidence of a healthy market.

In fact, Microsoft has hardly suffered from its apparent indiscretion, becoming one of the wealthiest companies in the world. It’s more profitable now than it was at the height of its notoriety, despite the fact that many of its rivals are now soaking up the attention. 

The makers of real-time messenger Slack say that its business is being ripped off by Microsoft Teams, which is now bundled as part of Office 365. “They created a weak, copycat product,” said Slack general counsel David Schellhase “and tied it to their dominant Office product.” Schellhase added that it’s the same play Microsoft adopted in their (admittedly successful) attempt to topple Netscape Navigator. Slack has now filed a complaint with the European Commission, asking for regulators to investigate the behavior. 

But that is for the future. We’re at the very start of Big Tech’s antitrust reckoning, but it’ll be interesting to see how all of this shakes out. Maybe, we’ll see a whole new wave of innovation and a whole new bunch of companies emerging from the conflicts. What will the next tech giant create in the wake of what happens in the next few years? We don’t know, but perhaps it’ll be just as interesting as what came after Internet Explorer.

The issue is significant enough that Homeland Security issued an advisory encouraging people to both be aware of the flaw and consider implementing workarounds, including temporarily restricting access to jscript.dll.

Unlike the Firefox bug, though, you’ll have to wait a while for a patch. Microsoft said it wasn’t likely to provide its fix until its next monthly security release, slated for February 11th. Until then, you’ll either have to consider workarounds or be cautious about clicking links to visit unfamiliar sites.

The risks might not be extremely high given the modern browser market. Microsoft has largely showed Internet Explorer to the side in favor of Edge, which just got a major Chromium-based revamp on January 15th, and you’re statistically more likely to use a third-party browser like Chrome. Nonetheless, it’s a headache — Microsoft’s past is coming back to haunt its present.

The release also brings office-friendly features like group policy support, stricter security measures and “enterprise-grade” PDF viewing. Microsoft is starting to roll out some features that will be ready over the course of “several weeks,” including integrated search for people, a business-focused new tab page with Office 365 links and secure data syncing.

Dev builds are very early and likely to include bugs. You won’t want to use this as your main browser for work or pleasure if you absolutely depend on a glitch-free experience. It brings the revamped Edge one step closer to fruition, though, and should prove sweet news for IT admins who want to be sure IE mode handles their needs.

The vulnerability affects Windows 7, Windows 10 and Windows Server 2012 R2.

This wouldn’t be an issue if it weren’t for the disclosure of the flaw. Page posted details of the exploit after Microsoft reportedly declined to roll out an urgent security fix. It instead said a fix would be “considered” in a future release. While that does suggest a patch is on the way, it leaves millions of users potentially vulnerable unless they either turn off Internet Explorer or point to another app that can open MHT files.