Word 2003 with the Office Compatibility Pack will also work with docx files, but Office 2003 is no longer supported and MS will be discontinuing the Office Compatibility Pack in April.
Why do you need 'the earliest version of office' that works with docx files? Why not something more recent? As for where you might get one, try ebay - but caveat emptor (there's a lot of people selling invalid OEM copies of Office).
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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