The default format for Word 2007 is not the same as the format for Word
2003, but that doesn't mean the programs are incompatible.
When you click the Office button and choose to open the Save As dialog,
there is a dropdown at the bottom of the dialog that's labeled "Save as
type". Click the arrow on the dropdown to open it, and select "Word 97-2003
Document (*.doc)".
If you usually want to save in the .doc format and only occasionally in
..docx format, go to Office button > Word Options > Save and change the
dropdown labeled "Save files in this format" to say "Word 97-2003 Document
(*.doc)".
Users of Office 2000 through 2003 can get a compatibility pack at
http://www.microsoft.com/downloads/details.aspx?FamilyId=941B3470-3AE9-4AEE-8F43-C6BB74CD1466
to be able to open and edit .docx files. You shouldn't expect everyone to
use this, though.
You shouldn't need it now, but to see your Product ID number, go to Office
button > Word Options > Resources and click the About button.
--
Regards,
Jay Freedman
Microsoft Word MVP
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