
Office 2016 for Mac is designed from the ground up to take advantage of the latest Mac features, including Retina display, full screen view support, and scroll bounce. It’s the perfect combination of the Office you know and trust, and the Mac you love.
Q: Does this one run on the new Mac OS High Sierra?
A: Yes, it works well on my MacBook Air with High Sierra.
A: You can install on another iMac and register (activate) on the new iMac. Make sure to remove from the 2010 iMac. Don't think they have the Uninstall (Remove Office) anymore, so you will need to delete and clean the ~/Library folder.
Q: Is this a onetime permanent installation or is it a yearly subscription?
A: Hi Ruth, this specific product is a one-time purchase which you install once and have for keeps. If you're looking for a subscription based experience, look into Office 365. This link also has great information differentiating the two: https://support.office.com/en-us/article/What-s-the-difference-between-Office-365-and-Office-2016-ed447ebf-6060-46f9-9e90-a239bd27eb96
A: No, this is for the purchase of one product key.