Sorry,I was thinking of office 2003,some of the file formats changed after that.Oh ok sorry from your last post i thought you meant you can open 2007 documents in 2010 but not 2010 in 2007.
Thanks
2010 will open 2007 docs. On 2010, you can save the documents as 2007 version which makes them fully comaptable and openable with 2007. Hope this helps