Here is a synopsis of what this post will walk through:
Downloading free evaluation ISOs (180 day) of Windows
Using a Packer template To load the ISO in a VirtualBox VM and customize using a Windows Autounattend.xml file.
Optimize the image with Boxstarter, installing all windows updates, and shrinking as much as possible.
Output a vagrant .box file for creating new VirtualBox VMs with this image.
Sharing the box with others using Atlas.Hashicorp.com (View Highlight)