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It has been reported that clicking a malformed 'callto:' URI in Internet Explorer will cause Windows 2000 systems to crash, resulting in a blue screen. This appears to be due to a boundary condition error in one of the URI parameters of the CALLTO protocol handler.

It has been reported that clicking a malformed 'callto:' URI in Internet Explorer will cause Windows 2000 systems to crash, resulting in a blue screen. This appears to be due to a boundary condition error in one of the URI parameters of the CALLTO protocol handler.