I tend to go along with Tuvok. It sounds as if you may have both MS Office and Open Office installed, with MS Office having run out of any trial period. If MS Office is set up to be the default for document files then it will open and fail to print your document. If you save the attachment to your drive first, and then open Open Office, and open the document from within that; that may work. If it does then you have to change the default from MS to Open Office. You can do that by right clicking on a document file and choosing "open with" and then when you have selected Open Office ensure you tick the box that says to always use Open Office.