Situation: I finally convinced my dad to let me install Xubuntu on his desktop, since Windows XP had become extremely bloated, old - it's a mess. So I installed Xubuntu 12.10 alongside the Windows partition, and he wants me to move all his .doc and .xls files to the new partition before I erase the Windows partition. This is easier said than done. My dad has subdirectories upon subdirectories, and I really don't want to have to manually go through every single folder to get all his documents and spreadsheets.
Question: How do I move all his .doc and .xls files to a new folder?
Additional Info: I know there are ways to move all files, but I only want to move files of a certain type (.doc, .xls). I've already tried
find "/media/gregory/Secondary/Documents and Settings/Gregory Davidson" -name '*.doc' | xargs -i cp /home/gregory/Documents, but when I manually checked, it hadn't moved the documents in many, if not all, of the subdirectories.