Unreadable text and characters display when using Office Online or previewing a document or email


When viewing a file, for example an email preview or a spreadsheet, unreadable characters are displayed, however when opening the file using a desktop app the content is displayed correctly.

This can be experienced when:

  • Previewing an Email
  • Using Excel Online
  • Previewing using OneDrive


The font within in the document cannot be loaded using the browser when using Excel Online or previewing the document with OneDrive. This causes the font to change to Unicode text.

The document still contains the data, however the browser cannot display it correctly. 


As the issue is with how the browser interprets the font used in the spreadsheet, your IT team will need to review why the browser is instead displaying Unicode text. 

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