We are constantly being asked by our customers if they need to upgrade to Office 2007 and the real answer to this is not cut and dried. Now that Office 2007 has been in circulation for quite awhile now so the problem that many people who have not upgraded is the inability to read or edit the new Office 2007 XML file format. One way to solve this problem is of course to purchase the upgrade but in many cases all you really need to do is install the Office Compatibility Pack so that you view and work with the newer Microsoft document file formats saved in XML.
Be sure to run all your updates to your system before installing this add in. Read the instructions and Systems Requirements before you install. Even though it is pretty straight forward you do need to pay attention to the prep work that needs to be done.