Microsoft Navigates a Mixed Bag: Starbucks Goes DIY While OpenAI Reaffirms Its Role

The software giant found itself caught between two very different narratives this week. On one side, Starbucks — a long-standing customer — announced it was developing its own artificial intelligence tools to replace Microsoft’s inventory management software, part of a broader $2 billion cost-cutting program that could strip away some $400 million in annual software spend. On the other, OpenAI made a point of publicly underscoring that its new GPT-5.6 model would be the preferred engine for Microsoft 365 Copilot, a move widely read as an effort to quiet speculation that the partnership was cooling.

The contrasting headlines sent Microsoft shares on a seesaw. Following the Starbucks news, the stock slipped more than 1% in pre-market trading, with IBM taking an even harder hit of over 4%. Yet by Friday, Microsoft had regained its footing, closing at €339.75 — up 1.09% from the previous day’s €336.10. The broader market was mixed: the S&P 500 eased 0.28% while the Nasdaq inched up 0.2%, reflecting a rotation out of established tech stalwarts.

Analysts, however, appear unfazed by the Starbucks defection. The consensus on Microsoft remains a clear buy, with a 12-month price target implying roughly 47% upside. IBM, by contrast, garners only a moderate buy recommendation. The real test, many say, will come with Microsoft’s fiscal fourth-quarter earnings on July 29, 2026, when investors will scrutinise whether Azure’s growth and the broader cloud business can withstand pressure from clients building in-house AI alternatives. Analysts expect earnings per share of $4.24 on revenue of $87.61 billion.

The Starbucks move taps into a deeper anxiety among enterprise software investors: that generative AI is making it easier for big customers to bypass traditional vendors. Starbucks is now building its own alternatives for inventory management, with the first new applications potentially live by the end of next year. The coffee chain’s decision to examine every technology contract is part of a $2 billion savings drive. For Microsoft, losing a large customer to internal development is a headache but hardly existential — the company’s Azure cloud platform continues to post strong growth, having expanded 40% in the most recent quarter.

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

The OpenAI announcement, meanwhile, provided a timely counterweight. In a blog post on Thursday, OpenAI unveiled GPT-5.6 and emphasised that it would be the preferred model in Microsoft 365 Copilot across Word, Excel, PowerPoint, Chat and Cowork. The timing was significant: Bloomberg had earlier reported that Microsoft was replacing some OpenAI software with its own in-house models — dubbed MAI — to reduce costs, a move that had stoked questions about the future of the alliance. OpenAI’s post did not refute that report but instead sought to reframe the narrative, stressing that the two companies remain closely aligned. “We can’t wait for customers to see what GPT-5.6 delivers in Microsoft 365,” said Nitin Agrawal, President for Copilot & Agents Core at Microsoft.

The commercial stakes are high. Microsoft 365 Copilot is one of the most widely deployed enterprise AI products, and OpenAI’s role as the default model generates substantial revenue from usage fees. Any erosion of that status — even partial, to MAI — would dent one of OpenAI’s most dependable income streams. Observers, however, tend to see the MAI project not as a break but as a sign of a maturing, diversified supply chain. Platform companies inevitably build alternatives when a single dependency becomes too large, even while continuing to buy from the original partner.

Technically, Microsoft’s stock remains well off its highs. At €339.75, it sits 28.9% below the 52-week peak of €478.10 reached last October, though it has climbed 10.6% from the June low of €307.10. The share price is 2.4% below the 50-day moving average of €348.21 and roughly 10% below the 200-day average of €378.99. The relative strength index at 50.6 points to a neutral stance, suggesting the market is waiting for a catalyst — likely the July 29 earnings release, where Azure growth and cloud margins will dictate the next move.

Until then, Microsoft’s story is one of crosscurrents: a loyal customer turning into a competitor, and a key partner reasserting its place. Investors will be watching to see which current flows stronger.