Hi goldfinga,
Error code 0x800CCC0B means “Server or mail drop is busy”. I would suggest you to try the steps below and check if it helps.
Step 1:
Temporarily disable or if possible **uninstall** the antivirus program and test the issue. Make sure you enable it back or install the antivirus software after testing the issue.
**Disable antivirus software**
***Warning:***Antivirus software can help protect your computer against viruses and other security threats. In most cases, you should not disable your antivirus software. If you do have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you are connected to the Internet or a network during the time your antivirus software is disabled, your computer is vulnerable to attacks.
Step 2:
Try the steps from the following article link:
**Troubleshoot problems with Windows Mail - I can receive, but not send, e** **‑mail messages.**
Also, have a look at the following link wherein a similar issue has been resolved:
Cannot send mail from windows mail using skymail. Error code 0x800CCC0B
Also, post your queries related to Microsoft Works in Microsoft Office Forums > Additional Microsoft Office Products Forums.
Hope this helps. Let us know if you need further assistance.
Thanks and Regards, Santosh Y – Microsoft Support
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