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Outlook Error Code 0x80040115 typically occurs due to poor internet connectivity, oversized or corrupt OST/PST files, faulty add-ins, or incorrect DNS settings. It may also stem from outdated Outlook versions, damaged user profiles, or antivirus/firewall interference. To fix it, try restarting Outlook in Safe Mode, repairing your Outlook profile, updating Outlook, or temporarily disabling security software. If manual solutions fail, use a professional recovery tool Aryson OST Recovery to repair and restore corrupted Outlook files. This ensures complete mailbox recovery without data loss. Regular updates and profile maintenance can help prevent this error in the future.