Outlook Error 0x800ccc0f in Windows 10 usually appears due to unstable internet connectivity, incorrect mail server settings, firewall restrictions, or a corrupted PST file. To resolve it, start by checking your network connection and restarting both Outlook and the system. Verify POP/IMAP and SMTP server details, including port numbers and SSL settings, as provided by your email service. Temporarily disable Windows Firewall or antivirus software to ensure they are not blocking Outlook. You can also try repairing the Outlook data file using ScanPST.exe. If the error continues because of severe PST corruption, a reliable solution Aryson Outlook PST Repair Tool can help. It efficiently repairs damaged PST files, recovers mailbox data, and works smoothly on Windows 10. Regular backups and proper Outlook shutdowns help prevent this error in the future.