The ‘Something went wrong [1001]’ error happens when signing in to Outlook or other Microsoft 365 apps, usually caused by a broken sign-in cache, security software blocking the WAM plug-in, or MFA misconfiguration. Here’s how to fix it on Windows, Mac, and mobile.
This classic Outlook startup error is usually caused by a corrupt navigation pane file, a damaged profile, a corrupt data file, or a problem add-in. Reset the navigation pane first — it fixes most cases in seconds.
Outlook error 0x800CCC0E means Outlook cannot connect to or authenticate with your mail server during send/receive. It is most often fixed by enabling SMTP authentication or correcting server/port settings.
This classic Outlook startup error is usually caused by a corrupted navigation pane, a damaged profile, a faulty add-in, or a corrupted PST/OST data file – here’s how to diagnose and fix it step by step.