Google Drive’s Docs, Sheets, and Slides apps are scheduled to cease supporting exports to Microsoft’s older Office 97–2003 formats at the end of the month. According to the Google Apps blog,
In September, we added the ability to export Google documents to the newer Microsoft Office formats that rely on open standards (.docx, .xlsx, .pptx). . . . As we announced in October, after January 31, 2013, users will not be able to export files to the older Office 97-2003 formats [e.g., .doc, .xls, .ppt]. For users who still use Office 97-2003, we recommend installing the free compatibility plugin from Microsoft, which will allow them to open the modern Office file types.
Disclaimer: The views expressed on this site are my own and do not necessarily reflect those of any other person(s) or institution(s).
Disclosure of Material Connection: Some of the links in the content above may be “affiliate links.” I only recommend products or services I genuinely believe will add value to you as a reader. But if you click one of these links and purchase the item, I will receive an affiliate commission from the seller at no additional cost to you. Consequently, I am disclosing this affiliate status in accordance with the Federal Trade Commission’s 16 CFR, Part 255: “Guides Concerning the Use of Endorsements and Testimonials in Advertising.”