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This is not a change from the past. Regardless of what version of office you are running, you cannot use the same retail license on more than one computer. This has been true for a very long time. If you currently have 4 machines and you currently have office on them - you will have had 4 licenses - either that or some of your PCs are running pirated copies. Your work PC should be licensed by your company. Your home machine is your responsibility. If you also have a laptop, if it is work-related, your company should be paying for the license, and unless your tablet is a Surface Pro - you can't get Office for it.