When you install the new Office 2007 the first thing you want to do is show the developer tab.

You should display the Developer tab or run in developer mode when you want to write macros, run macros that you previously recorded, or create applications to use with Microsoft Office programs.

1. Click the Microsoft Office Button Button image, and then click Excel Options.
2. Click Popular, and then select the Show Developer tab in the Ribbon check box.

Source: office.microsoft.com/en-us/excel/HA101730521033.aspx