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Azure Linux 4.0 is Microsoft’s first general-purpose Linux

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Linux Microsoft’s in-house Linux, the distribution that grew out of CBL-Mariner, just hit public preview as a general-purpose cloud OS you can run on any Azure VM and coming soon to WSL. Microsoft shipped Azure Linux 4.0 into public preview at Build 2026, and for the first time you can run it on any Azure virtual machine, not just as the host underneath Azure Kubernetes Service. That sounds like a small distinction. But, this is the moment Microsoft's in-house Linux stops being a special-purpose appliance distro and becomes a general-purpose Linux distro. I have been following this distribution since before it had a marketing name. So let me put 4.0 in context... Photos from the Azure Linux 4 session at Microsoft Build 2026 What I keep on about Microsoft has built more than one Linux distribution. Back in February 2022 I went looking through Microsoft's package mirrors and found CBL-Delridge , a Debian-based distro that powered Azure Cloud Shell. It was never announced.…

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