Outlook Add-In Email Sync Error

Outlook Add-In Email Sync Error

When sending emails and trying to add the email to Zoho CRM using the Outlook Add-In, we get an unhandled exception error.

We are running Outlook 2013 and using the plugin "Supported Microsoft Outlook versions: 2007, 2010 & 2013"

Screenshot attached.

Please advise if there is a fix for this. Thanks