Microsoft's $625 Billion Backlog Faces a Critical Test Amid Rival Onslaught

Microsoft's April 29 earnings report is pivotal as investors weigh $281B OpenAI commitment, robust Azure growth, and new AI competition from Anthropic.

Microsoft's upcoming quarterly report on April 29 is shaping up to be a defining moment, as the tech giant navigates a complex web of operational strength, immense financial commitments, and emerging competitive threats. The stock, trading around 360 euros, remains more than 23% below its 52-week high of 467 euros, a discount that reflects deep-seated market anxieties despite a recent 10% bounce over the past week.

At the heart of investor concern is the sheer scale of Microsoft's reliance on a single partner: OpenAI. The company's record commercial remaining performance obligation (RPO) stands at $625 billion. A staggering 45% of that backlog, equating to $281 billion, is tied to the ChatGPT developer. This massive commitment now appears on shakier ground following OpenAI's February announcement that it plans to spend only about $600 billion on compute capacity through 2030, a sharp reduction from an initial projection of $1.4 trillion. How Microsoft addresses this potential overhang in its guidance will be a key focus during the earnings call.

Operational performance, however, tells a story of robust growth. For its second quarter of fiscal 2026, revenue climbed 17% to $81.3 billion. The Azure cloud platform has been a standout, posting growth of at least 39% in each of the first two quarters. For the upcoming Q3, company leadership anticipates Azure growth in a range of 37% to 38%, with adjusted earnings per share expected to reach $4.04, a nearly 17% year-over-year increase. Missing that Azure target could intensify selling pressure.

Supporting this growth requires monumental investment. Capital expenditures surged 66% year-over-year to $37.5 billion in Q2 alone, putting Microsoft on track for roughly $100 billion in annual investment spending. For the full fiscal year, the company has earmarked a colossal $146 billion for AI infrastructure.

This spending spree is now facing a new competitive challenge. On April 19, AI rival Anthropic launched "Claude for Word," a native add-in that operates directly within Microsoft 365. This move directly undercuts Microsoft's flagship Copilot, which costs business users $30 per month. If enterprises opt for third-party AI tools within Microsoft's own ecosystem, it threatens the monetization of the company's massive bets. Investor scrutiny on April 29 will heavily focus on the growth of paying Copilot users within Microsoft 365 as a signal of AI's revenue potential.

Compounding these strategic pressures are significant technical headaches. Microsoft confirmed on April 19 that its security update KB5083769 was triggering BitLocker recovery screens on some Windows 11 devices. Just two days prior, the company acknowledged a separate server update, KB5082063, was sending certain domain controllers into reboot loops due to a crash in the LSASS process, primarily affecting firms using Privileged Access Management.

Simultaneously, the company is undertaking a foundational security overhaul not seen in 15 years, allowing existing Secure Boot certificates to expire. Devices older than two years must transition to new certificates by June 2026, a complex process that, if mismanaged, could leave firmware vulnerable.

The confluence of these factors has left Microsoft's stock trading at a valuation level reminiscent of 2017, a stark contrast to its double-digit growth. To return to its five-year average price-to-earnings ratio of 32.9, the share price would need to rally 24%. This gap underscores the deep pessimism already priced in. With a $625 billion backlog providing underlying stability, the April 29 report will be judged on whether Microsoft's immense AI investments are finally bearing tangible fruit or if rivals and internal challenges are beginning to erode its formidable position.