Microsoft Faces Dual Legal Challenges Even as In-House AI Models Gain Traction

Microsoft’s stock experienced a split personality this week as investors weighed promising progress in the company’s proprietary AI models against a fresh wave of litigation and rising input costs. Shares climbed 1.75 percent on Tuesday to €340.40 after reports surfaced that Excel and Outlook are now running tens of thousands of weekly inference requests on Microsoft’s own MAI models, reducing the company’s dependence on external partners OpenAI and Anthropic. But much of that gain was erased by Wednesday’s close, when the stock slipped 1.53 percent to €335.25, dragged down by two class-action lawsuits and a cautious analyst downgrade.

The pivot toward in-house AI is part of a broader cost-discipline push that has been quietly gaining momentum. Microsoft AI chief Mustafa Suleyman has been blunt about the goal, telling attendees at the company’s Build developer conference in June that the MAI models are designed to replace expensive external services. “We pay a lot of money to Anthropic — our goal is to reduce these costs and eventually eliminate them entirely,” he said. Seven new models were unveiled at Build, one of which is said to match the performance of Anthropic’s popular Opus 4.6 at a significantly lower cost. The MAI models are now also available in GitHub Copilot, Microsoft’s AI-assisted coding tool. While they still account for a small fraction of total AI volume, the shift strengthens Microsoft’s negotiating position with OpenAI as usage scales across Office and Teams.

The positive narrative around AI efficiency was overshadowed this week by a securities fraud class action filed in the U.S. District Court for the Western District of Washington. The complaint accuses Microsoft of making misleading statements about the performance of its Copilot assistant and Azure cloud platform, artificially inflating the stock price. It covers purchasers of Microsoft securities between May 1, 2025 and January 28, 2026, and names four executives as individual defendants. Several law firms — including Levi & Korsinsky, Bronstein Gewirtz & Grossman, Pomerantz, and Bleichmar Fonti & Auld — have issued investor notices, with a lead plaintiff deadline of August 11, 2026. A previous investor complaint was filed after the stock briefly dropped 10 percent. The Wall Street Journal has reported that Copilot is struggling with functional issues, losing market share amid confusing branding and compatibility problems.

A second lawsuit landed on Wednesday, this time from residents near Microsoft’s newly completed Fairwater data center in Mount Pleasant, Wisconsin. Three homeowners from nearby Sturtevant filed a class action alleging that excessive noise from the facility is damaging their property and disrupting their lives. One plaintiff said he had to change his work shift because the noise made it impossible to sleep. The suit seeks to represent more than 1,000 households within a 1.5-mile radius. Microsoft has said it wants to be a good neighbor and previously claimed the noise problem had been resolved, a statement the plaintiffs clearly reject. The data center is central to Microsoft’s AI expansion; CEO Satya Nadella once called it “the most powerful AI data center in the world.” It processes 865,000 tokens per second and represents a $7.3 billion investment.

Should investors sell immediately? Or is it worth buying Microsoft?

The legal troubles come at a time when the stock is already under pressure from rising infrastructure costs. Wolfe Research recently cut its price target on Microsoft from $570 to $525, driven by higher memory chip prices that have lifted the company’s fiscal 2027 capital expenditure estimate from $230 billion to $270 billion. Analyst Alex Zukin lowered his 2027 gross margin forecast to 63.1 percent, well below the consensus estimate of 66.6 percent. He maintained an Outperform rating, citing long-term confidence in Microsoft’s ability to monetize AI across the full stack.

Cost discipline is evident elsewhere in the organization. Microsoft has confirmed additional job cuts tied to its AI investment strategy, with 3,200 positions slated for elimination at the Xbox division by fiscal 2027. The first 1,600 cuts took effect in early July, and four gaming studios are being spun out. The combination of in-house model development, workforce reductions, and tighter capital allocation suggests management is fighting to protect margins even as AI spending ramps up.

The stock now trades nearly 17 percent below its level at the start of the year and is down 28.80 percent from its October record of €478.10. It sits just below its 50-day moving average of €348.91 and far under its 200-day average of €380.01. On the bright side, the shares have recovered 10.84 percent from the year’s low of €307.10 reached in late June. The next quarterly report, due later this month, will offer a clearer picture of Azure growth, Copilot adoption, and how quickly the in-house AI push can begin to offset the mounting legal and cost headwinds.