Office Online supports the following file types.

Supported files for viewing:

  • Word files: .doc, .dot, .dotx, .docx, .docm, .odt
  • Powerpoint: .pot, .potm, .pps, .ppsm, .ppt, .pptm, .pptx, ppsx, .odp
  • Excel .xls, .xlsx, .xlsm, .xlsb, .ods

Supported files for viewing, editing and annotating:

  • Word: .docx, .docm, .odt
  • Excel: .xlsx, .xlsm, .xlsb, .ods
  • Powerpoint: .pptx, ppsx, .odp
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