Why do I get error code 0x8004210b when using Outlook?
Outlook error code 0x8004210b occurs when Outlook is having issues connecting to a remote server and a timeout occurs.
There a few reasons for this to happen, mostly related to the client-side of the transaction:
- Corrupt Outlook installation
- Windows Registry issues with Outlook
- Corruption with OutlLook application files due to malware
- Missing Outlook files
- Antivirus/Firewall software blocking Outlook
The following site provides detailed information about the issue and applicable workarounds to fix the issue: