Opening Office 2007 documents in earlier versions

I've received a file in .docx format - how do I open it, i'm using Microsoft Office Word 2003?

The documents can be opened it but you will first need to download the Microsoft Compatibility pack for 2007 Office - you can download this at the following link http://office.microsoft.com/en-us/word/HA100444731033.aspx

This will allow you to open other Office 2007 documents such as Excel and PowerPoint.