If you have installed MS office 2007 from pirated CD or from Office 2007 Blue edition, your MS office 2007 is on great risk of getting notification from Microsoft, you may get following message if your PC is connected with internet.
This copy of Microsoft Office is not genuine.
Please excuse this interruption. This copy of Microsoft Office did not pass validation. Click Learn More for details and for help identifying the best way to get genuine Microsoft Office
There are 15 -18 countries including US, UK, INDIA etc are now on the target of Microsoft . After Office Genuine Advantage Notifications (KB949810) you can not open any MS file like MS word, MS presentation or Excel file. It can also disable MS Office 2003 .
If you are using genuine MS Office 2007, There is no problem for you. But if you are using pirated copy, to protect your MS office 2007 you must disable Auto update facility of MS office 2007, During Auto update Microsoft can detect your MS copy 2007 information.
If your MS office 2007 already got Office Genuine Advantage Notifications ( OGA KB949810). than you should uninstall the program and reinstall MS office with auto update disabled. More information is here