Before you throw your computer out…
There are tons of common errors that occur with Microsoft Outlook, including many of the numeric string codes (example: 0x800CCC0F). Here is a list of the common errors and a quick explanation and solution for each error:
1. Email Help for Error 0x800CCC0F when sending or receiving email
This is almost always due to some form of an antivirus program or an email scanner program of some sort that is blocking Outlook from doing its job. Disable the software and try again to see if the error was fixed.
Another probable cause is some form of a firewall program (anti virus software as well) is blocking the ports. Disable your firewall, and try again. If the problem persists, check out this guide: Cannot start outlook
2. Error 0x800CCC7D when trying to send out an email
This is a really simple thing to fix: Head over to the outlook settings to the account you are having issues with, then un-check the “this server requires SSL authentication” option. The error you are receiving is caused by your email provider not supporting SSL.
This should fix your problem.
3. Error 0x800CCC78 when trying to send out an email
This is a simple typo error most likely coming from the “from” section of your email. Make sure you don’t have extra spaces or anything that would cause the address to be invalid. Make sure that you have the correct outlook settings for the outgoing server.
There is a complete guide for error code #0x800ccc0e <- there, which explains how to fix the server settings that you may have setup incorrectly, in addition to ways to test communication with your email servers.