The procedure is rather simple, too -- just open a command prompt window as administrator and run a file named "ospprearm.exe" which should be located in %installdir%%Program Files%Common FilesMicrosoft SharedOfficeSoftwareProtectionPlatform, where %installdir% is "C:" on most machines and %Program Files% will be the Program Files (x86) folder If you installed the 32-bit edition of Office 2010 on a 64-bit operating system.
As an alternative to the above steps, there's also a free utility available here to extend your trial period with the click of a button. The rearm feature is aimed at enterprise administrators who use a single copy or image, to deploy a supported operating system and accompanying software on hundreds or thousands of PCs. Nevertheless, the "trick" has been widely publicized online to regular home users and Microsoft seems okay with it.
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