If you've been using the 30-day trial version of Microsoft Office 2010, here's a nice tip for you: the testing period can be extended for up to six months. 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.