Microsoft released two patches for eight security holes in its March “Patch Tuesday” drop, but also issued an advisory about a recently discovered flaw in Internet Explorer. … The bugs fixed by the two patches are rated “important,” the second highest ranking on Microsoft’s four-tier severity rating scale. … One bug that Microsoft did not fix this time around is a zero-day flaw in the way older versions of Windows handles help files and scripting — Microsoft sent out a Security Advisory regarding the hole last week. … According to Microsoft, the zero-day help file hole affects Windows 2000 Service Pack 4 (SP4), Windows XP SP2 and SP3, as well as 64-bit versions of XP Professional SP2, and Windows Server 2003. More recent releases of Windows, including Vista, Windows Server 2008, and Windows 7, are not at risk, Microsoft said.
Source: eSecurity Planet