Microsoft had restricted users from transferring your Office 2013 license in previous policy, but now they amended the license agreement. Without having to pay for a new licence, customers are able to transfer Office 2013 License to new computer (not more than one time every 90 days)
While Windows 7/8 system crashes and is unrecoverable or you have bought a new PC or tablet, it is useful to move license to a new computer.
* First uninstall Office on old computer. Open Control Panel > Add/Remove Programs, and choose the suites to remove complecetly
* On another computer that belongs to you, go to install your Office 2013 software, and then enter the 25-digit Product Key. You can find the key from the CD case or in the confirmation email while bought online.
* Then call Microsoft for confirm that and get a new activation code.