Microsoft Office 2010 needs to be activated after 30 days. It can be rearmed 5 times, every rearm gives you additionally 30 days to activate.

If you always rearm it on the last day before it has to be activated that makes a total evaluation time of 6 * 30 = 180 days.

You can use this tool to rearm Office 2010 5 times. Just re-apply once the 30 days are over.

Limitations:

Improvement: Supports Office 2013
Update: Renamed to Office Trial Extender-
Update: All files are digitally signed

Limitations: This program is advertising supported and may offer to install third party programs that are not required for the program to run. These may include a toolbar, changing your homepage, default search engine or other third party programs. Please watch the installation carefully to opt out.