Issue: cell/text formatting is automatically removed after I open a saved 
document.  This problem has occurred 3-4 different spreadsheets:  

-	After I upgraded to Office 2007, I was working on a basic spreadsheet 
(just data columns with fonts, font colours, font highlights and sorted) that 
I had previously saved using 2003 as a XLS.  I was using/running 
Compatibility mode and no compatibility issues where reported when I saved 
the documents.  After I added a few new lines, I saved the excel spreadsheet 
as XLS and reopened the file, all of the cell formatting – font, colours, 
where moved and I was left with a basic black text document in the excel 2007 
default font and no colours or cell formatting.

Why does this keep occurring?