Hi there,
Microsoft Office 2010 defaults to the docx format. You best bet to make sure your documents are compatible with all versions of Office is to save them as Word 97-2003 documents (many computers still run Office 2003). You'll know if your document is saved in the compatible format because it will end in .doc instead of .docx.
I hope this was helpful.
Isabella
MSFT Office Outreach Team
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