Outlook Cannot Connect to Server – What It Means and How to Fix It

'Outlook cannot connect to server' means Outlook can't reach the mail server at all. Here's what causes it and how to restore your connection.

What type of email account is this?

Work or school email (Exchange / Microsoft 365)

Your company's server settings or credentials changed — this is an IT issue, not something you can fix alone.

Next step: Contact your IT helpdesk. They'll need to verify your account status and may need to update the server settings on your device.

Personal Outlook.com or Hotmail

Microsoft's servers may be having a temporary outage, or your local credentials expired.

Next step: Check status.office.com for any active incidents. If status is OK, open Outlook → File → Account Settings → your account → Test. Sign out and back in if needed.

Gmail or another provider via IMAP/POP

Your email provider may have changed security requirements (common after enabling two-factor auth).

Next step: Check your provider's current IMAP/POP settings page. If 2FA is enabled, you likely need an 'app password' — most providers generate these in account security settings.

Frequently asked questions

Will I lose my emails if Outlook can't connect to the server?
No. Your emails are stored on the mail server, not just in Outlook. Once the connection is restored, all emails will be accessible again. Emails received while disconnected are queued on the server.
Is 'Cannot Connect to Server' the same as the server being down?
Not always. It also appears when your credentials are wrong, your network blocks the connection, or Outlook's local settings are outdated. Check your internet connection and try accessing the same account via webmail (Outlook.com or your company's webmail) to confirm the server is reachable.
How do I fix Outlook Cannot Connect to Server?
First check your internet connection. Then in Outlook: File → Account Settings → select your account → Test Account Settings. If it fails there, the server name, port, or credentials need updating — contact your email provider or IT department for the current settings.
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