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Microsoft Cuts AI Bill by Replacing OpenAI and Anthropic in Software Products

• Microsoft is replacing OpenAI and Anthropic with in-house MAI models in Excel and Outlook.
• Tens of thousands of weekly prompts now run on Microsoft's internally built AI models.
• Microsoft started cancelling most internal Claude Code licenses in 2026.

Tens of thousands of prompts in the two applications now run each week on Microsoft’s internally built models.
Microsoft consumes huge volumes of AI tokens across products such as its Copilot assistant. It currently gets much of that computing at a discount through a long-standing partnership with OpenAI.
Reported that Excel and Outlook had previously leaned more on OpenAI and Anthropic. Now, MAI usage accounts for a small share of overall AI activity.

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# Microsoft t # OpenAI # Excel

Microsoft to Cripple Older Office Apps on Mac in July 2026
Microsoft is preparing a licensing change that will quietly turn many older Office apps on Mac, iPhone, and iPad into glorified viewers in mid‑2026. Starting July 13, 2026, affected Office for Mac installations will enter “reduced functionality mode,” where users can open and print documents but can no longer edit, save, or create new files unless they upgrade to a supported OS and Office version
What Exactly Happens on July 13, 2026?
According to Microsoft’s own support documentation, Office apps on macOS, iOS, and iPadOS that aren’t updated to supported builds by July 13, 2026 will “still open and print files” but will lose the ability to edit, save, or create new documents. Word, Excel, PowerPoint, Outlook, and OneNote all fall under this reduced functionality mode
This behavior is tied to a digital certificate that Microsoft uses to validate Office licenses on Mac and iOS. Once that certificate expires, older Office builds can no longer verify that you have a valid license, so the apps respond by cutting off editing features while still letting you view your files.
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