Not a loss leader, it's still $17.08 Billion dollars (~5%) of their revenue according to bullfincher:

In fiscal year 2026, Microsoft Corporation's revenue by segment (products & services) are as follows:

    Dynamics Products And Cloud Services: $9.01 B
    Enterprise and partner services: $8.26 B
    Linked In Corporation: $19.82 B
    Microsoft Three Six Five Commercial Products And Cloud Services: $102.00 B
    Microsoft Three Six Five Consumer Products and Cloud Services: $9.18 B
    Other Products And Services: $109.00 M
    Search Advertising: $15.18 B
    Server Products And Cloud Services: $129.43 B
    Windows and Devices: $17.08 B
    XBOX: $21.79 B

This is down from 2024, when Windows was $23 Billion of revenue equaling nearly 10% of their annual revenue.

https://bullfincher.io/companies/microsoft-corporation/reven...