OSE — Operating System Environment
Category: licensing
Microsoft's term for one running instance of Windows — either physical (the bare-metal install) or virtual (a Hyper-V or VMware VM). Server licensing counts OSEs to determine how many copies you can run on a given host.
Windows Server Standard grants 2 OSEs per fully licensed server; Datacenter grants unlimited OSEs.
Example & usage
A Hyper-V host running Windows Server Standard licensed for 16 cores can run the host OS plus 2 VMs (3 OSEs total — the host is one). License the same cores twice and you can run 4 VMs.
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