Microsoft posted $90 billion in revenue for fiscal Q4 2026, up 17.7 percent year on year. Operating income rose 18.3 percent to $40.6 billion, and net income climbed 31.3 percent to $35.77 billion. The software and cloud group exited the quarter with $76.84 billion in cash and equivalents, having spent $41 billion on capital expenses in the period alone.

What did Microsoft spend on infrastructure?

For full fiscal 2026, Microsoft committed $145.3 billion to capital expenses. Roughly two-thirds paid for CPUs and GPUs deployed in clusters; the remaining third funded datacenter facilities and other long-lived assets. Microsoft said it would hold fiscal 2027 capex flat at $190 billion, choosing not to accelerate spending the way several cloud and hyperscale peers have done.

The quarterly capex breakdown mirrors the full-year pattern. About two-thirds went to systems supporting Azure, the rest to datacenters and facilities. The spending discipline has paid in equity terms. Following the results, Microsoft's market capitalization reached $3.44 trillion.

How did the three operating segments perform?

• Productivity and Business Processes: $37.85 billion in sales, up 14.3 percent. Operating income hit $21.9 billion, a 57.9 percent margin.
• Intelligent Cloud: $39.31 billion, up 31.6 percent. Infrastructure costs compressed margins to 40.6 percent, generating just under $16 billion in operating income.
• More Personal Computing: $12.85 billion, down 4.4 percent. Operating income fell to $2.75 billion on a 21.4 percent margin.

Services revenue drove the quarter, climbing 22.7 percent to $72.77 billion. Product sales edged up 0.6 percent to $17.23 billion.

How large is Azure, and how profitable?

Independent modelling places Q4 Azure infrastructure revenue at $31.91 billion, up 64 percent year on year. Azure operating income reached an estimated $13.93 billion on a 43.6 percent margin, up 68.8 percent. Microsoft disclosed that the overall Azure business crossed $100 billion in revenue for fiscal 2026, a threshold no commercial cloud platform has touched before.

The broadly defined Microsoft Cloud category, which covers PC and server software sold under utility pricing, booked $59.3 billion in sales, up 27 percent. Gross profit hit $38.55 billion, up 21.4 percent, comprising 65 percent of those cloudy revenues.

What sits inside the "real systems" business?

Stripped to its on-premises Windows Server stack and baseline Azure IaaS, what one analyst calls Microsoft's "real systems business" generated just over $22 billion in Q4, up three-tenths of a point. Operating income came in at $8.94 billion on a 40.6 percent margin. Few systems businesses in history have reached this size at this profitability.

Where does the AI money actually show up?

Microsoft did not break out a formal AI run-rate figure. Analyst estimates put Q4 AI ARR at approximately $44.5 billion, roughly double the year-ago figure. Q4 AI revenue itself reached $11.13 billion, equal to 12.4 percent of Microsoft's total top line. Two years earlier, the AI business was five times smaller.

Copilot adoption rose to 30 million seats, up from 20 million three months earlier. The seat count provides a usage signal rather than a dollar figure.

What does the backlog tell us?

Microsoft closed the quarter with $678 billion in contracted backlog, overwhelmingly weighted to Azure. Microsoft did not split out an OpenAI-specific figure this period, but management stated that the non-OpenAI portion grew 25 percent. The arithmetic leaves OpenAI's contracted Microsoft capacity at an estimated $255.1 billion, with $422.9 billion coming from all other customers.

How big is the AI piece relative to the whole?

The takeaway from the numbers is unambiguous: AI dominates the public conversation about Microsoft, but AI has yet to dominate Microsoft's income statement. Cloud and legacy software still fund the bulk of operations. At 12.4 percent of total revenue, the AI line item remains a fast-growing minority contributor, not yet the engine of the enterprise.