Happy New Year and congrats on having more than a month already down in 2010! (Yeah, it's late. Hopefully the tie-in pays off.) January 30, 2010 marks 3 years since Office 2007 came out. The question I propose, can we finally stop forcing the default for users to be the 2003 format?
The Office 2007 Open XML format has many features over the previous formats including file size and security: http://msdn.microsoft.com/en-us/library/aa338205.aspx
People using older versions of Office can open the newer formats using the free add-on from Microsoft. All staff computers should have Office 2007 at this point and employees can install Office 2007 at home free by picking up the install CD from the Help Desk.
If not now, then when?