I did a bit of checking, and this program appears legitimate.
Microsoft Volume Licensing - Microsoft Software Assurance Benefits - Home Use Program
However, there is a huge cavieat to this program--your workplace needs to be a participant in order for you to be able to take advantage of this. Also, once your employment with your workplace ceases, you are required to uninstall the software.
For a workplace to be an active participant, the workplace has to have a volume license with software assurance. If you don't know what that means, ask your IT department if your workplace participates in the program.
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