Microsoft is advising customers to move to Internet Explorer 6 Service Pack 1 and more recent patches following the leak of Windows NT and Windows 2000 source code to the Internet last week. While downplaying the potential for hackers to uncover new vulnerabilities in Windows by having access to the source code, one top Microsoft Windows executive said during a monthly security briefing on Tuesday that customers using IE 5.x or IE 4.X versions should quickly download the latest IE code to protect their networks.

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