关于harmon.ie插件在Outlook网页端无法拖放附件的技术咨询

Let’s walk through targeted fixes for your harmon.ie drag-and-drop issue—since it works on the Outlook desktop client but fails in OWA with your SharePoint 2013 On-Premises setup, the problem is likely tied to IE11 configurations or plugin integration specifics.

1. Fix IE11 Compatibility & Add-on Settings #

• First, ditch Compatibility View for your OWA site:
  • Open IE11’s Tools > Compatibility View settings and make sure your OWA domain isn’t listed. Harmon.ie relies on modern browser APIs that get broken by legacy compatibility modes.
• Confirm the harmon.ie add-on is enabled:
  • Go to Tools > Manage add-ons, find the harmon.ie extension under Toolbars and Extensions, and set it to Enabled. Restart IE11 after making changes.

2. Align IE11 Security Zone Configurations #

IE11’s cross-zone restrictions often block drag-and-drop between OWA and SharePoint:

• Open Tools > Internet options > Security tab.
• Ensure both your OWA site and SharePoint 2013 site are in the same security zone (e.g., Local Intranet or Trusted Sites). Mixing zones breaks cross-app drag-and-drop.
• For that zone, click Custom level, scroll to the Drag and drop and copy/paste section, and set Allow drag and drop files to Enabled.

3. Update Harmon.ie to a SharePoint 2013-Compatible Version #

Outlook 2016 CU6 and SharePoint 2013 On-Premises need a specific harmon.ie build to support OWA drag-and-drop:

• Grab the latest harmon.ie update tailored for SharePoint 2013 On-Premises (check your internal admin portal or plugin management console). Older versions have known OWA drag-and-drop bugs with IE11.
• After updating, clear IE11’s cache (Tools > Internet options > Delete... > check Temporary Internet Files and website files > Delete) and restart the browser.

4. Validate SharePoint 2013 Farm Integration #

• Activate the OWA support feature in SharePoint:
  • In Central Administration, go to System Settings > Manage farm features and make sure harmon.ie for Outlook Web App is activated.
• Check web application permissions:
  • Ensure the OWA service account (or end-user accounts) have the necessary permissions on your SharePoint site. Missing read/write access can block drag-and-drop sync between OWA and SharePoint.

5. Debug with IE11 Developer Tools #

If the above steps don’t work, dig into browser-level errors:

• Press F12 to open Developer Tools, switch to the Console tab, and watch for JavaScript errors when you attempt to drag an attachment. Look for blocked scripts or missing harmon.ie resources.
• Check the Network tab to confirm all harmon.ie-related assets load without 404/500 errors.

内容的提问来源于stack exchange，提问作者user1643030