Open the file Office 2007 - 2010 with Office 2003

You often changing Microsoft word? means you often use Microsoft word with a different type. home you use Microsoft word 2003, then in the office sometimes use Microsoft word 2007, and in a cybercafe might use Microsoft word 2010. so how is this, if we want to open the document in Microsoft word the three kinds of these.Let us see how the technique?Must file that you create at home or you may