"Support" is non existent from Microsoft. Later versions of Word added functions like XML support and features that might be of interest to their corporate clients. Later versions are ways for Microsoft to get their corporate customers with thousands of desktops to upgrade. The reality is that Windows 2003 applications work perfectly on Windows 7 and Windows 8 and will work perfectly on Windows 9 when it arrives.
I follow the advice that if it ain't broke don't fix it. It definitely applies to Microsoft as much as anything else.