Although Microsoft didn't release any new security bulletins in March, it did post revisions Tuesday of two critical vulnerabilities from earlier in 2005 to provide patches for obsolete operating systems.

The two patches add Windows 98, Windows 98 SE, and Windows Me to the list of those fixed against a pair of vulnerabilities in January and February of this year.

The January bulletin addressed a bug in the handling of icons and cursors, while the February alert took care of a vulnerability in Windows' Hyperlink object library.

Windows 98 and Windows Me are both "out of lifecycle" in Microsoft's support jargon, which means that free security fixes for those vulnerabilities judged "critical" by the Redmond, Wash.-based developer are created and distributed, but not necessarily at the same time as OSes such as Windows XP.

Priority is given to operating systems still fully supported. Microsoft, however, has committed to providing "critical" fixes for Windows 98 and Windows Me through June 30, 2006.

To obtain the fixes, Windows 98 and Me users should head to the Windows Update site.