How to transfer word dictionary from 2003 to 2010?

Using add to dictionary option in MS Word 2003, I keep adding new words, which are red underlined in my word documents. I have installed MS Word 2010 and noticed while typing documents that most of the words, which I added do not get picked automatically by MS Word 2010, in fact those words are missing from MS Word 2010 dictionary. I want to transfer my word dictionary from 2003 to 2010. Suggest me the best possible solution of how doing this?
