Managing personal Outlook.com account settings, security, and privacy
The Dutch ads/sidebar content does not by itself prove the account is still being accessed. After a compromise, attackers often change account or service settings, and some pages or content can continue showing a different language even after the main display language is changed back.
What matters most is whether the account is now secured. Since the password was already changed and the forwarding rule was removed, the next checks are:
- Review recent sign-in activity.
- Go to the Recent activity page and verify whether there are any new sign-ins, devices, or locations that are not recognized.
- Microsoft shows sign-ins from the last 30 days.
- Check account settings that attackers commonly change.
- Review connected accounts.
- Review forwarding.
- Review automatic replies.
- If any suspicious settings remain, remove them.
- Sign out of active sessions everywhere.
- Use the Microsoft account security options to remove trusted devices or sign out everywhere so any existing attacker session is forced out.
- This can take time to fully apply.
- Check for other compromise symptoms in Outlook.
- Missing or deleted mail.
- Suspicious Inbox rules.
- Suspicious messages in Sent Items or Deleted Items.
- External forwarding that was recently added.
- Secure the device used to access the account.
- Run a full antivirus or malware scan before making further security changes.
- Keep the operating system and antivirus updated.
- Strengthen recovery and sign-in protection.
- Add or review alternate email address and mobile phone security info.
- Turn on multi-factor authentication.
- Use a strong, unique password.
If new unfamiliar sign-ins continue to appear on the Recent activity page after the password change and sign-out actions, that is a strong sign the account or device is still at risk. If the account cannot be fully secured, use the Microsoft account recovery/sign-in helper flow, which can also route to support.