I give you a trial product but once you are satisfied and you have enough money, I highly recommend you to buy product key to support the developers.
To buy product key you visit https://www.microsoft.com
Free Microsoft Office 2007 Product Key for You
(Source: Microsoft Office 2007 Key)
I hope you will find the right product key for your Microsoft Office 2007.
After you install these keys, you have 30 days to use MS office 2007.
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Microsoft Office 2007 features
The new user interface (UI), officially known as Fluent User Interface, has been implemented in the core Microsoft Office applications: Word, Excel, PowerPoint, Access, and in the item inspector used to create or edit individual items in Outlook. These applications have been selected for the UI overhaul because they center around document authoring. The rest of the applications in the suite changed to the new UI in subsequent versions. The default font used in this edition is Calibri. Original prototypes of the new user interface were revealed at MIX 2008 in Las Vegas.
The Office 2007 button, located on the top-left of the window, replaces the File menu and provides access to functionality common across all Office applications, including opening, saving, printing, and sharing a file. It can also close the application. Users can also choose colour schemes for the interface. A notable accessibility improvement is that the Office button follows Fitts’s law.
The ribbon, a panel that houses a fixed arrangement of command buttons and icons, organizes commands as a set of tabs, each grouping relevant commands. The ribbon is present in Microsoft Word 2007, Excel 2007, PowerPoint 2007, Access 2007 and some Outlook 2007 windows. The ribbon is not user customizable in Office 2007. Each application has a different set of tabs that exposes functions that the application offers. For example, while Excel has a tab for the graphing capabilities, Word does not; instead, it has tabs to control the formatting of a text document.