This can be achieved by running the Office OSPPREARM which is located in the Program Files folder. Running this will command the Trial will be extended by 30 days, it can be run five times.
How to extend the Office 2010 Trial period
1. Open a Command Prompt as Administrator (Quickest method is to the CMD in Windows 7 start menu search and hit return)
2. You need to navigate to one of the following paths:
64 Bit Office 2010, 64 Bit Windows
c:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform
32 Bit Office 2010, 64 Bit Windows
c:\Program Files (x86)\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform
3. Now run the OSPPREARM.exe file located in one of the above folders and you should received a “Microsoft Office rearm successful” message if you receive “Error: 0xc004d307 On a computer running Microsoft Windows non-core edition, run ‘slui.exe 0x2a 0xc004d307’ to display the error text.” This happens because all of the 5 rearms have been used. 
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