Error occurs when you send or receive an email message in Outlook or Outlook Express
Outlook 2007 – Sending reported error (0x800CCC0F).
http://answers.microsoft.com/en-us/office/forum/office_2007-outlook/outlook-2007-sending-reported-error-0x800ccc0f/258a6e06-a0ce-4cb4-803f-b1e103c7f8e3
Solutions
http://support.microsoft.com/kb/813514
