Word 2007 versus Word 2010 file formats

Are the file formats for Word 2007 and 2010 exactly the same? Or, is some behind-the-scenes conversion going on when I swap a document between a machine running Office 2007 and Office 2010?
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DrTribosConnect With a Mentor Commented:
Hi there,

The answer might depend on what you mean by "exactly the same".  

In Word 2010 there are many options to save in an earlier version type format by using file Save As.  In that same dialogue I was unable to find any differentiation between Wd2007 & Wd2010.

Both these formats are in docx which is really a container for other files... you can change the extension to ".zip" and then take a look inside.  I don't have Wd2007 so can not make a file for file comparison but I believe the file and folder structure is the same for both, I may be corrected here.  This image and the following code is from a file created and saved in Wd2010 A look inside a Word 2010 ".docx" File
However, when you look at the content of the files you might find some differences.
<?xml version="1.0" encoding="UTF-8" standalone="true"?>-
<w:document mc:Ignorable="w14 wp14" xmlns:wps="http://schemas.microsoft.com/office/word/2010/wordprocessingShape" xmlns:wne="http://schemas.microsoft.com/office/word/2006/wordml" xmlns:wpi="http://schemas.microsoft.com/office/word/2010/wordprocessingInk" xmlns:wpg="http://schemas.microsoft.com/office/word/2010/wordprocessingGroup" xmlns:w14="http://schemas.microsoft.com/office/word/2010/wordml" xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main" xmlns:w10="urn:schemas-microsoft-com:office:word" xmlns:wp="http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing" xmlns:wp14="http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:wpc="http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas">-
<w:p w:rsidRDefault="00D350B7" w:rsidR="006C58FD">
<w:bookmarkStart w:name="_GoBack" w:id="0"/>
<w:bookmarkEnd w:id="0"/>
</w:p>-<w:sectPr w:rsidR="006C58FD">
<w:pgSz w:w="11906" w:h="16838"/>
<w:pgMar w:gutter="0" w:footer="708" w:header="708" w:left="1440" w:bottom="1440" w:right="1440" w:top="1440"/>
<w:cols w:space="708"/>
<w:docGrid w:linePitch="360"/>

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For example, if you scroll across the longest line of xml in the above code you will see some references to word 2010, I figure that these would not appear in a file that was created and saved using word 2007 alone.

Therefore I suggest that, for arguments sake, a blank file saved by word 2007 is probably not 'exactly' the same as one saved by word 2010.  Whether this is important really depends on your requirements &/ reason for asking.

I agree with ThinkPadsUser that the files open in each application seemlessly.

AnonymousConnect With a Mentor Business Consultant (Owner)Commented:
I interchange Office 2007, 2010 and 2013 documents freely with no difficult at all.

You can use higher level functionality in newer versions but I do not do that.

So interchange at will and you should not have difficulty.

... Thinkpads_User
AnonymousBusiness Consultant (Owner)Commented:
I have all versions of Word from 2013 back to Word 2000. Anything I create in Word 2013 is backward compatible to Word 2007 without changes. Of course you do have to be prepared to use only common functions (which is the majority of functions).

... Thinkpads_User
jdanaAuthor Commented:

Fascinating. I learned a lot. Thx.
Pleasure. Thanks.
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