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Outlook Add-in fails to load


Sometimes, Outlook Add-in can fail to load, it might display nothing or wrongly display the interface.


Clear cache of the browser and Outlook because the cache contains out-of-date scripts, css, image files.

Clear the following cache data on the default browser:

To delete Outlook cache:

  • Outlook for Windows: delete content of the folder %LOCALAPPDATA%\Microsoft\Office\16.0\Wef
  • Outlook for MAC: delete content of 2 folders:
    • ~/Library/Containers/
    • /Users/{your_name_on_the_device}/Library/Containers/com.Microsoft.OsfWebHost/Data/


Applies to: RC 4.1

Reference: TFS #236491

Knowledge base ID: 0288

Last updated: May 18, 2020

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