Microsoft Office 2007 SP2 will add support for Open Document Format
Microsoft has announced plans to add support for a several new document formats to Office 2007. The company plans to release Office 2007 SP2 during the first half of 2009, and it will add support for XPS, PDF 1.5, and ODF 1.1 files, among others.
Users will be able to create, open, and edit ODF documents, and save documents as XPS, PDF, or ODF files. The Open Document Format, or ODF is an open source challenger to Microsoft's Office formats. A few years ago the company released an add-on for Microsoft Word that would allow users to open ODF documents. But with the launch of Office 2007 SP2, support for ODF and PDF files will be built right into the applications. No add-ons necessary.
Or you could just use OpenOffice.org today. No waiting until 2009 necessary.