https://store.digitalriver.com/DRHM/servlet/ControllerServlet?Action=DisplayOrderInformationPage&SiteID=msshca&Locale=en_CA said:
Can I only install this software on one computer?
As with any Microsoft® Office software you buy at retail, you are licensed one copy of the software for use on one device and are allowed to install another copy on a portable device for use by the single primary user of the licensed device.As with any Microsoft® Office software you buy at retail, you are licensed one copy of the software for use on one device and are allowed to install another copy on a portable device for use by the single primary user of the licensed device.