BEFORE you purchase Microsoft Office...

...look at the information I've collated.

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Office Home and Student 2013

    The latest Office applications—Word 2013, Excel 2013, PowerPoint 2013, OneNote 2013
    One user, one PC
    Non-transferable license
    Non-commercial use rights

Office Home and Business 2013

    The latest Office applications—Word 2013, Excel 2013, PowerPoint 2013, Outlook 2013, OneNote 2013
    One user, one PC
    Non-transferable license
    Commercial use rights

Office Professional 2013

    The latest Office applications—Word 2013, Excel 2013, PowerPoint 2013, Outlook 2013, OneNote 2013, Access 2013, Publisher 2013
    One user, one PC
    Non-transferable license
    Commercial use rights

http://www.microsoft.com/oem/en/licensing/productlicensing/Pages/office-2013-licensing-packaging.aspx#fbid=-vt_pUPlc0Z

...The Office 2013 software is licensed to one computer for the life of that computer and is non-transferable...

http://blogs.office.com/b/office-news/archive/2013/02/19/office-2013-and-office-365-installations-and-transferability.aspx

...Microsoft spokesperson Jevon Fark...

"...the Office 2013 software is licensed to one computer for the life of that computer and is non-transferable..."

http://www.eweek.com/enterprise-apps/microsoft-addresses-controversial-office-2013-license-lock-in/

A single user copy of Office 2013 is licensed to a single machine, not to a single user. Officially: The software license is permanently assigned to the device on which the software is initially activated. That device is the “licensed device”...

http://www.techrepublic.com/blog/window-on-windows/office-2013-licensing-changes-increase-it-angst/7301

...With Office 2013, the retail editions are for one PC, no exceptions.  Your perpetual license is locked to one PC. The new license agreement contains identical language for all three retail editions: “Can I transfer the software to another computer or user? You may not transfer the software to another computer or user. You may transfer the software directly to a third party only as installed on the licensed computer, with the Certificate of Authenticity label and this agreement”...

http://www.zdnet.com/big-changes-in-office-2013-and-office-365-test-microsoft-customers-loyalty-7000011389/

...With Office 2013, you only get a license for one PC. More than that, the license is tied to that PC -- if your PC dies, for whatever reason, your license expires with it.

http://www.infoworld.com/t/office-software/microsoft-mangles-office-2013-licensing-212977