When attempting to use the Dynamics 365 App for Outlook, you see the following error:

"Dynamics 365 App for Outlook didn't load completely. Please ensure you are connected to internet and restart the add-in."

If you click the "Show more" link, the additional details includes the following error:

"Error: window.Office not available"


While loading Dynamics 365 App for Outlook, external script office.js might fail to load. Because office.js is a required dependency, Dynamics 365 App for Outlook cannot start and will show an error.


  1. Verify your computer has a connection to the Internet.

  2. If you are using Outlook desktop app follow this guide to ensure that you online

  3. Reload Dynamics 365 App for Outlook.

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