Microsoft is optimizing its upcoming Office Web Apps for .docx, .pptx, and .xslx, which will boost the online accessibility of documents uploaded from users’ desktops—but in the process, perhaps making life more difficult for those using older versions of Office.

During testing of the Web Apps technical preview, eWEEK found that documents with .xls and .ppt file extensions could not be edited through the browser, although they could still be viewed and downloaded.

Web Apps displayed error messages whenever an attempt was made to online-edit PowerPoint documents with a .ppt file extension, or Excel spreadsheets with an .xls file extension.

Article @ eWeek