Web payment firm Paypal has said it will block "unsafe browsers" from using its service as part of wider anti-phishing efforts.
Customers will first be warned that a browser is unsafe but could then be blocked if they continue using it.
Paypal said it was "an alarming fact that there is a significant set of users who use very old and vulnerable browsers such as Internet Explorer 4".
Phishing attacks trick users into handing over sensitive data.
Paypal said some users were still using Internet Explorer 3 , released more than 10 years ago. It lacks many of the security and safety features needed to protect users from phishing and other online attacks.
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