Microsoft has revealed that a specially-devised message can be used to crash the software - effectively a denial of service attack.
It is possible to write a script which will repeatedly target the server's IP address or URL to make sure that Windows 2000 is not able to restart itself following an attack. A hacker would not be able to gain control over the server or add, change or delete any data held on it, although any Web-based mail sessions in progress would be halted.
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According to Microsoft's Technet Web site, because the flaw occurs in two code modules that are found separately in the two applications it is necessary to patch both of them.