There are many reasons behind the occurrence of Outlook error 0x800ccc0f such as internet disconnectivity, OST file corruption, server issues, firewall blocking etc. It usually appears while sending or receiving the emails. You can follow this blog for detailed info:
https://msoutlookhelp.com/blog/outlook-error-0x800ccc0f-resolve/
When you use Microsoft Outlook Express to send and receive mail to a Post Office Protocol 3 (POP3) or Internet Message Access Protocol (IMAP) server running Exchange 2000 Server or Exchange Server 2003, you may receive the following error message. Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity.
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