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Why hasn't Outlook recognized that I've uninstalled the Barracuda plugin for the Email Security Gateway?

  • Type: Knowledgebase
  • Date changed: 3 years ago
Solution #00002942

Barracuda Spam Firewalls models 300 and above, all firmware versions, all plugin versions.

Barracuda Networks makes no assurances or warranty with regard to the effects of the following instructions on non-Barracuda devices or software. To the extent permitted by law, Barracuda Networks excludes all liability in contract, tort, breach of statutory duty or otherwise for any costs, losses, claims, damages, expenses, or proceedings incurred by users or their affiliates resulting either directly or indirectly from following the direction contained herein. Users take such actions at their own risk.

Most uninstallation issues occur when Outlook is stull running during the uninstall. Please make sure Outlook is not running when uninstalling the Barracuda plugin.

If, after uninstalling the plugin, Outlook still looks for the BarracudaAddin.dll file as it opens, your Outlook might still be configured to look for the Outlook plugin that is no longer there. The steps for disabling the Outlook plugin after an incomplete uninstallation differ between Outlook 2003 and Outlook 2007.

1. To disable the Outlook plugin in Outlook 2003, go to the Tools > Options > Other tab, select Advanced Options, go to the Add-In Manager, and deselect the BarracudaPlugin entry. If you wish to know which registry keys are added so that you can remove them manually, they are given below. Please take care when editing the Windows Registry; Barracuda Networks is not responsible for any problems that may occur with any windows machines as a result of registry tampering.


The actual values might be a little different, but the registry keys will be named as above.

2. To disable the Outlook plugin in Outlook 2007, go to the Tools > Trust Center page, and navigate to the Add-ins tab. Select COM Add-ins from the Manage drop-down menu, click Go, uncheck the box next to the Barracuda plugin's entry, and click OK. If this doesn't work, you may need to remove the extend.dat file. To remove the extend.dat file in Outlook 2007, first close Outlook. Then, go to Start > Run (from the taskbar), type %appdata%, and press Enter. Go into the Microsoft\Outlook folder, and you should see the extend.dat file. Delete this file (remember, Outlook 2007 must be closed). This should prevent the BarracudaAddin.dll message from appearing when opening Outlook 2007.

If this fails:

Use the Outlook 2007 Trust Center:

    • Open Outlook
    • Navigate the menus through: Tools Trust Center... Add-ins (on the left)
    • Ensure "COM Add-ins" and/or "Exchange Client Extensions"is showing next to "Manage:", at the bottom of the dialog
    • Click [Go...]
    • Untick "[ ] The offending extension"
    • Click [Ok]
    • Restart Outlook and verify that it worked.

    Additional Notes:
    For more information, please see the attached Outlook Plugin installation guide below.

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