Save document as .doc (not .docx)
because office 2007 formats are not compatible with older versions and Microsoft wanted to be sure you don't try to open it with older office like 2003 for example. if you still want to use old version of office and open newer files like .docx go to Microsoft download page and download compatibility pack for your office. its official, free and working :)
.doc files would automatically open with office 2007 if you want to save an office 2007 file as .doc, while saving choose the format as Outlook office 2003 format and it would save your file as .doc instead of the .docx that office 2007 gives
Yes you can ----------- There is a compatability pack for office 2003 to be able to read and write to the .docx(office 2007) documents.
Because by default, the Office 2007 version of Word uses DOCX, not the traditional DOC.
docx becomes .zip when opened from webMS Office Support
The major difference is file format. MS office 2007 uses xml file format ie docx, xlsx, pptx, etc.
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Office 2007 uses a newer file format than Office 2003. For example, instead of .doc, a file from Word 2007 will be in the .docx format, something Office 2003 doesn't understand. For compatibility, Office 2007 can be made to save files in the .doc format. Office 2003 can also gain compatibility with Office 2007 file formats by downloading and installing an add-in at http://office.microsoft.com/search/redir.aspx?AssetID=DC101298101033&CTT=5&Origin=HA100444731033 More on this at http://new-digital-world.blogspot.com/2008/03/office-2007-files-to-office-2003.html
Download FileFormatConverters from Microsoft. This program will allow you to pen docx files with earlier versions of Microsoft Office.
You need to open the files with the appropriate Office 2007 program and save in compatibility mode. You usually cannot open Office 2007 files with Office 2003.
Version 2003 - .doc , version 2007 - .docx