Start with the right service
Outlook.com requires Modern Authentication/OAuth2. Correct ports cannot compensate for a mail client that only attempts an unsupported password-only connection.
Configuration quick reference
| Reference | What to check |
|---|---|
| Connection and access | OAuth2 is required for Outlook.com POP/IMAP/SMTP access; use a compatible application. |
| Account authority | Use the original provider for identity verification, account recovery, eligibility and billing. |
Official reference: Microsoft OAuth2 requirement. Check the provider’s current instructions before changing settings. Reviewed October 14, 2026.
Work through the problem
- Identify the app version and confirm it supports Microsoft OAuth2.
- Use the Microsoft account option when adding a personal Outlook.com or Hotmail address.
- Complete sign-in only on the official Microsoft authorization page and review the requested access.
- For a work or school account, ask the administrator about organization policies rather than applying consumer-mail settings.
Keep a useful diagnostic record
Note the exact error, the application and version, and whether the same account works on the provider’s website. Record whether sending, receiving or sign-in fails. Remove private message content from screenshots before sharing them.
If you use POP or local folders, preserve those messages before removing an account. A new account configuration may not recover data stored only on the old device.
Choose your next step
For an app-only problem, compare authorization and settings with the official reference above. For an account restriction or failed identity check, continue with the original provider. Independent assistance cannot bypass these controls.
Related guides: IMAP, POP and SMTP · Password recovery · Email synchronization.