If you have Office 2010 for non-commercial use, it may seem that their Office licensing applies to Office 2013 as well, one license per PC. If said PC dies, so does the license. I find that to be bullocks especially with a Windows 8 PC, if the PC dies, the license dies as well. BUT, if the hard drive dies, a reinstall can be done and the same license as before can be used just fine. Ideally, Microsoft should change things so Office licensing ties into the PC's BIOS license key.