I recently found on the latest update of Avast! 6.0.1289 that I started getting 0x800ccc0f errors in Outlook when sending and receiving email.
I was able to resolve it by :
1. removing the ssl accounts under Real-Time Shields | Mail Shield | Expert Settings(button) | SSL accounts then select the known non TLS or SSL accounts and delete them by selecting the row and selecting the delete button that appears on the right side of the line.
2. Select OK
3. Then test Outlook by sending and receiving .. if it still gives the error
4. Go back to the mail shield and unselect the check boxes for Scan inbound and outbound messages
5. Close Avast user interface
6. re Open Avast user interface and recheck the check boxes for Scan inbound and outbound messages
Your problem should be fixed.