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HyperV Builder
The HyperV Packer builder is able to create Hyper-V virtual machines and export them.
hyperv-iso - Starts from an ISO file, creates a brand new Hyper-V VM, installs an OS, provisions software within the OS, then exports that machine to create an image. This is best for people who want to start from scratch.
hyperv-vmcx - Clones an an existing virtual machine, provisions software within the OS, then exports that machine to create an image. This is best for people who have existing base images and want to customize them.