Microsoft’s $678B backlog fuels AI optimism amid capex scrutiny

Microsoft ↗ 0.45% closed its fiscal 2026 fourth quarter with Azure and other cloud services growing 43% year-over-year, pushing the unit past $100 billion in annual revenue for the first time. The milestone, reported on July 29, has reshaped the competitive landscape among the three largest cloud providers and raised fresh questions about how long AI-fueled demand can sustain these growth rates.

Record Quarter Anchored by AI Demand

Group revenue rose 18% to $90 billion for the quarter ended June 30, while net income advanced 31% and operating income climbed 18% to $40.6 billion. CEO Satya Nadella highlighted that Azure revenue surpassed $100 billion for the fiscal year, and that Microsoft 365 Copilot now has more than 30 million paid seats.tradingview+1

Perhaps more telling than the quarter itself is the commercial backlog. Microsoft's remaining performance obligations reached $678 billion, up 84% year-over-year with an average contract duration of 2.3 years. That figure covers Microsoft's entire commercial business, not just Azure, but it signals that customers have already committed hundreds of billions in future spending to Microsoft's ecosystem.ad-hoc-news+1

Hyperscaler Scoreboard Draws Comparisons

The quarter ended June 30 for all three major cloud providers, and the results reported in late July set up a direct comparison. Alphabet ↗ 0.66% posted Google Cloud revenue of $24.8 billion, up 82% year-over-year, while Amazon Amazon.com, Inc. ↘ 0.64% Web Services grew 37% to $42.2 billion. Amazon CEO Andy Jassy called it AWS's "fastest growth in 18 quarters."theglobeandmail

In absolute dollar terms, the gap narrows. Google Cloud added roughly $11.1 billion in year-over-year revenue versus AWS's $11.4 billion. Google Cloud's annualized run rate now approaches $99 billion — nearly matching the milestone Azure just crossed. Google Cloud's backlog reached $514 billion, and CEO Sundar Pichai said the company remains "supply constrained — a sign of momentum and rapid adoption."aol+1

The Capex Question

The growth has come at a cost. Microsoft's capital expenditure jumped roughly 80% over fiscal 2026 to approximately $116 billion, with guidance pointing toward $175 billion for the current fiscal year. Free cash flow contracted more than 23% in the quarter. A Bank of America fund-manager survey in August found that 71% of respondents do not expect hyperscalers to cut AI investment.ad-hoc-news

Alphabet is spending aggressively as well, deploying $44.9 billion in capital expenditure during its second quarter alone — roughly double the year-earlier period — pushing free cash flow to negative $5.9 billion.theglobeandmail

The central tension for investors is now whether these infrastructure outlays can convert into sustained returns. Microsoft's shares rose roughly 18% in the week following its earnings report, but questions remain about the gap between announced spending and operational capacity. The planned autumn unveiling of Microsoft's next-generation Maia 300 AI chip will offer an early signal of whether the company can close that gap.ad-hoc-news