If ever you need help interpreting an error message, it's vital to quote the entire message. The error code alone is rarely enough to make it possible to diagnose the problem. However, in this case, I'm going to guess that the error message in fact reads something like:
| <br>Unable to send or receive messages for the [Hotmail] account. <br><br> <br><br>Server Error: 404 <br><br>Server: 'https://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx' <br><br>Windows Live Mail Error ID: 0x80194194 <br><br> |
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DeltaSync doesn't work any more since the migration of Microsoft email accounts to Outlook Mail. You'll find an explanation and a suggested remedy in this article: Windows Live Mail and Outlook Mail