One-time purchase for 1 device, PC or Mac. System Requirements: Windows 10 or macOS Office for Mac is supported on the three most recent versions of macOS. When a new version of macOS is released, the Office for Mac Operating System requirement becomes the then-current three most recent versions: the new version of macOS and the previous versions.. Microsoft support included for 60 days at no extra cost. Licensed for home and commercial use. Your activation code will be delivered on a Key Card with detailed instruction for installing the product. The manufacturer does not produce any CD/DVD/Flash drive for this product.