Microsoft Outlook is a powerful email client, but users may occasionally encounter various error codes that disrupt email functionality. This guide outlines some of the most common Outlook error codes, their causes, and step-by-step troubleshooting methods. 1. Error Code: 0x80042108 – Unable to Connect to Incoming (POP3) Mail Server Cause: Outlook cannot establish a connection to your mail server. Troubleshooting Steps: 2. Error Code: 0x80042109 – Cannot Connect to Outgoing (SMTP) Mail Server Cause: Outlook cannot communicate with the SMTP server. Troubleshooting Steps: 3. Error Code: 0x800ccc0e – Connection to …