If you are affiliated with a college, you may qualify for a four-year subscription to Office 365 University from Microsoft…
Though, it appears you must have an eddress that has an “edu” top-level domain.
It can be installed on two computers (Windows or Mac), and some mobile devices.
Office 365 University includes Word, Excel, PowerPoint, Outlook, OneNote, Publisher, and Access.
The supported operating systems include Windows 7, Windows 8 and Mac OS X 10.6 or later. But: “…you can install Office applications including Word, Excel, PowerPoint and Outlook on your Mac…” (Based on that statement I assume there’s a chance OneNote, Publisher, and Access will not function on a Mac.)
“Office 365 University is a four-year subscription for full- and part-time enrolled university and college students, faculty, and staff in accredited institutions…”
As I’m understanding it: you can install it once on two different computers within three years. What if a computer becomes unuseable? Or a licensed user wants to remove the product from one computer, and install it onto another?
The cost of the four-year subscription is only $79.99. Overall, it seems like a great deal to me…