HubSpot Sales for Outlook install error: 'Customized functionality in this application will not work...'

Last updated: November 13, 2018

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You may encounter the following error message when attempting to install the HubSpot Sales Outlook desktop add-in:

Customized functionality in this application will not work because the certificate used to sign the deployment manifest for Sidekick for Outlook or its location is not trusted.

To resolve this error:

  • Open Internet Explorer.
  • Click the settings icon settings in the upper right corner of the browser window, then select Internet Options.
  • Click the Security tab, then click Trusted Sites.
  • Click Sites.
  • In the Add this website to the zone field, enter, then click Add.