If you are running Microsoft Exchange Server in an Information Technology IT environment, you must take additional measures to guarantee the correct operation of your Exchange Server post-Daylight Savings Time.  You will need to use the Exchange Calendar Update Tool.

Daylight saving time is a system to set clocks ahead so that both sunrise and sunset occur at a later hour. The effect is more daylight in the evening. Many countries observe daylight saving time. Most of these countries have their own rules and regulations for when daylight saving time begins and ends.

The dates of daylight saving time (DST) may change from year to year. Microsoft Outlook users have to update their Outlook calendar every time that the DST rules change. The dates between the previous DST rules and the current DST rules are referred to in this article as the “extended DST period.”

The solution that is presented in this post involves the Microsoft Exchange Calendar Update Tool (“the Exchange tool”).

Based on customer feedback, a new version of the Exchange tool was released on August 13, 2007. This article refers to the new version of the Exchange tool. If you are running an older version of the Exchange tool, uninstall it, and then install the new version.

The new version of the Exchange tool includes the following improvements:

• The time zone extraction and calendar update processes are sped up fourfold.
• The user interface for the configuration tool is more streamlined and intuitive.
• The ability to update conference rooms and resource mailboxes is now built into the configuration tool.
• The ability to update user mailboxes is now built into the configuration tool.
• A troubleshooting document is now included with the Exchange tool, and it is integrated into the configuration tool.
• The time zone extraction algorithm and error handling capabilities are improved.
• The logging process is more user-friendly.

support.microsoft.com/kb/941018/

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