This article describes a hotfix that is available for users of the following components:

• Windows Service for UNIX
• Utilities and SDK for Subsystem for UNIX-based Applications (SUA)

This hotfix incorporates daylight saving time (DST) changes in Argentina, in Chile, in Egypt, in Iran, in Iraq, and in Israel.

An update for DST changes in 2007 is now available for computers that are running Subsystem for UNIX-based Applications (SUA) in Windows Vista.

Note: Subsystem for UNIX-based Applications is available in the following versions of Windows Vista:

• Windows Vista Ultimate
• Windows Vista Enterprise

Microsoft has released security bulletin MS07-053. The security bulletin contains all the relevant information about the security update. This information includes file manifest information and deployment options. To view the complete security bulletin, visit one of the following Microsoft Web sites:

• Home users:
  

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The U.S. Energy Policy Act of 2005, passed by the U.S. Congress July, 2005, extended daylight saving time (DST) in the United States. Beginning in 2007, DST will start three weeks earlier and end one week later than previously observed, resulting in a new DST period that is four weeks longer than previously observed. In 2007, DST will start on on March 11 and will end on November 4, 2007.

This change in DST applies to the United States and to Canada. Unless you apply this fix, the time that Microsoft Windows Services for UNIX returns and the time that utilities and time-related APIs in Subsystem for UNIX-based Applications return may be incorrect during this four-week period, depending on the location in the United States or in Canada and on the selected time zone.

When you try to run a Subsystem for UNIX-based Applications (SUA) application on a Windows Vista-based computer, the application may stop responding.