Microsoft’s OpenAI Fears Exposed in Musk Trial

Microsoft CEO Satya Nadella testified in the Musk v. Altman trial during the week of May 11, 2026, revealing that the company had privately worried about becoming too dependent on OpenAI as early as April 2022. The testimony, drawn from internal communications surfaced during discovery, offers the clearest public account yet of how Microsoft has navigated its high-stakes AI partnership — and the strategic anxieties that partnership has generated.

Nadella’s Trial Testimony: Dependency Fears and Musk’s Silence

Nadella took the stand on Monday, May 11, according to CNBC, completing his testimony in the civil case Elon Musk filed against OpenAI and its CEO Sam Altman. Musk named Microsoft as a defendant, accusing the company of aiding and abetting OpenAI’s alleged breach of charitable trust.

On the question of Musk’s objections to Microsoft’s investment in OpenAI, Nadella testified that Musk never raised any concerns with him directly. That account matters because Musk’s lawsuit centers partly on the claim that OpenAI’s shift toward a for-profit structure betrayed its founding mission — yet Nadella’s testimony suggests Musk did not flag those concerns to one of OpenAI’s largest backers at the time.

Separate discovery documents, reported by CNBC on May 13, showed Nadella was worried as early as April 2022 that OpenAI could supplant Microsoft in the technology hierarchy. “It was becoming even more core and important that we had real agency at every layer of the stack,” Nadella testified.

The Strategic Problem: Model-Level Competition

The internal anxiety Nadella described reflects a structural tension that has shaped Microsoft’s AI posture ever since. Microsoft established itself as a primary provider of AI infrastructure through its early investment in and partnership with OpenAI — giving Azure a significant commercial advantage as demand for AI compute surged. But at the model level, Microsoft has not produced a competitive foundation model of its own.

That gap has consequences. If OpenAI were to shift cloud providers, develop its own infrastructure, or lose market position to rivals like Anthropic or Google DeepMind, Microsoft’s AI narrative could weaken considerably. Nadella’s April 2022 concern — documented in internal communications and now part of the public trial record — shows the company recognized this exposure years before it became a topic of public discussion.

The trial has drawn unusual scrutiny to the mechanics of the Microsoft-OpenAI relationship, including the financial terms and the degree to which Microsoft’s infrastructure is woven into OpenAI’s operations. Those details remain partially sealed, but the testimony has confirmed that the partnership was never frictionless internally.

Edge Copilot Gets Cross-Tab AI Context

While the trial dominated Microsoft’s news cycle, the company also shipped a notable product update. According to The Verge, Microsoft Edge is adding a feature that allows its Copilot AI chatbot to pull information from all open browser tabs simultaneously.

The capability lets users ask Copilot questions about content spread across multiple tabs — comparing products, summarizing open articles, or querying information without switching between pages. In its announcement, Microsoft said users can “select which experiences you want or leave off the ones you don’t.”

As part of the same update, Microsoft is retiring Copilot Mode, a prior feature that also offered cross-tab context but included agentic capabilities such as booking reservations. Those agentic functions have been folded into other parts of the Edge experience rather than discontinued entirely. The move consolidates Microsoft’s browser AI offering around a simpler, more opt-in model.

Investor Confidence Holds Despite Stock Pressure

Microsoft’s stock has declined 16% in 2026 while cloud peers have traded higher, according to CNBC. That underperformance has not shaken institutional conviction in the company’s AI positioning, at least among some high-profile investors.

Billionaire hedge fund manager Bill Ackman disclosed a new position in Microsoft in May 2026. His rationale aligns closely with the argument CNBC’s Jim Cramer has made publicly: that Microsoft’s balance sheet gives it the capacity to act decisively on AI opportunities that smaller or more leveraged competitors cannot.

“The main reason we don’t want to sell [Microsoft] is because they actually have the balance sheet to do what they want,” Cramer said on Squawk on the Street on Friday, May 15. “Tomorrow, they could do something that is so revolutionary that we could say, ‘Why did we doubt them?'”

The balance-sheet argument is straightforward: Microsoft carries substantial cash reserves and has the borrowing capacity to fund large AI investments — whether in compute infrastructure, model development, or acquisitions — without the financial constraints facing newer AI-native companies.

The Trial’s Broader Stakes for Microsoft

The Musk v. Altman trial, which moved into closing arguments on May 14 according to The Verge, is nominally a dispute about OpenAI’s nonprofit obligations. But for Microsoft, the proceeding has functioned as an involuntary disclosure exercise — surfacing internal strategy documents, executive communications, and strategic anxieties that the company would not have chosen to make public.

The core allegation against Microsoft — that it aided and abetted a breach of charitable trust — faces a high legal bar. But the reputational and strategic exposure from the testimony is real. Nadella’s acknowledgment that Microsoft feared OpenAI dependency, combined with the company’s documented effort to build “agency at every layer of the stack,” confirms that Microsoft’s AI strategy is more defensive than its public positioning typically suggests.

Other witnesses in the trial included OpenAI cofounder Greg Brockman, former CTO Mira Murati (via videotaped deposition), and former OpenAI board member Shivon Zilis. Sam Altman took the stand on Tuesday, May 13, disputing Musk’s characterization of him as dishonest. The closing arguments were made available via a live audio stream on YouTube.

What This Means

The Musk v. Altman trial has done something no earnings call or product launch could: it has forced Microsoft to articulate, on the record, the strategic vulnerability at the center of its AI story. Nadella’s testimony confirms that Microsoft recognized, by at least April 2022, that relying on a single external partner for AI model capability was a liability — and that the company has been working to reduce that exposure ever since.

The Edge Copilot update and Ackman’s investment both point in the same direction: Microsoft is executing on the product and financial dimensions of its AI strategy with reasonable competence. The harder question, raised implicitly by the trial testimony, is whether the company can close the model-level gap with OpenAI, Anthropic, and Google before that gap becomes a commercial problem.

For now, Microsoft’s infrastructure position — Azure’s role as the compute backbone for a significant share of AI workloads — provides a durable revenue floor. But Nadella’s own words from 2022 suggest the company knows that infrastructure alone is not enough.

FAQ

What is Microsoft accused of in the Musk v. Altman trial?

Elon Musk named Microsoft as a defendant in his lawsuit against OpenAI and Sam Altman, accusing the company of aiding and abetting OpenAI’s alleged breach of charitable trust. The claim centers on whether Microsoft’s investment and partnership facilitated OpenAI’s shift from a nonprofit mission toward a for-profit structure.

What does the new Edge Copilot tab feature actually do?

The updated Copilot in Microsoft Edge can read content from all of your open browser tabs at once, allowing you to ask questions, compare products, or summarize articles across multiple pages without switching tabs. Microsoft is simultaneously retiring the older Copilot Mode, which offered similar context but included agentic features like booking reservations.

Why did Bill Ackman invest in Microsoft in 2026?

Ackman’s rationale, as reported by CNBC, mirrors the argument that Microsoft’s balance sheet — its cash reserves and borrowing capacity — gives it the financial flexibility to make large AI bets that competitors cannot easily match. The investment came despite Microsoft’s stock declining 16% in 2026 while cloud peers traded higher.