May i know whether in office 2007, would it be possible to add the superscript and sub-script buttons into the toolbar. Similarily, like those of previous office version 2000 & 2003 where the button exist for easier access. Otherwise, it would seem redundant to provide the function with an uphill task of calling the function out. Please enlighten me on this situation thank you.

Yes, those buttons are available - see here for an example: Office 2007: Formatting Text, UWEC