Issue

• You receive the following error message when starting Microsoft Outlook on an endpoint: "The Add-in 'ESET Outlook Plugin' (C:\PROGRA~1\ESET\ESETNO~1\EPLGOU~1.DLL) cannot be loaded and has been disabled by Outlook. If no update is available, please uninstall the Add-in."
• The error message above may occur on a computer with multiple user profiles after an upgrade, reinstall, or a failed uninstall of ESET security product
• Performance issues in outlook, unstable email client, compatibility issues with other plugins
• Duplicate emails in mailbox
• Disable the ESET Outlook Add-in

Always upgrade to the latest Endpoint version first before disabling the outlook integration and test if latest version solves Outlook related issues!

Solution

1. Open the ESET PROTECT (Cloud) Web Console in your web browser and log in.
2. Click Policies, select the check box next to the policy (baseline or customer policy) you want to modify, and click Actions → Edit.
   
3. Click Settings, expand Web and Email (1) and click Email client protection (2).
4. In the Email Clients Integration section, click the slider bar next to integrate into Microsoft Outlook (3) to disable it.
5. In the Email Clients section, click the slider bar next to Enable email protection by client plugin (4) to disable it.
6. In the Email Protocols section, click the slider bar next to Enable email protection by protocol filtering (5) to disable it.
7. In the Antispam protection section, click the slider bar next to Enable email client antispam protection (6) to disable it.
   
8. Click Finish to save your changes. 

These settings will result in a disabled Outlook plugin and no warnings will be shown in the protection status of the Endpoint.