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Important This update has been superseded by To obtain the most recent information about daylight saving time DST , click the following article number to view the article in the Microsoft Knowledge Base:. Important Before you apply the update that is described in this article, be aware of potential issues that may affect Microsoft Outlook. For more information about these issues, click the following article number to view the article in the Microsoft Knowledge Base:.

If you are running Microsoft Exchange Server in an Information Technology IT environment, you must take additional measures to guarantee the correct operation of Exchange Server. For more information about the Exchange daylight saving time DST update, click the following article number to view the article in the Microsoft Knowledge Base:. Cumulative time zone updates contain only data that has changed for a specific region or that has been added to maintain parity with other operating system versions.

Therefore, if a time zone key has been deleted, some original values may not be restored after you apply the cumulative zone update.

We do not recommend that you delete any registry keys that are related to time zones. On a computer that has incomplete time zone keys, first restore the time zone keys from a known good backup.

Then, apply the update. The update that this article describes changes the time zone data to accommodate daylight saving time DST changes in several countries, as outlined in this article.

This update also includes other DST-related changes, time zone-related changes, and settings-related changes. Some of these changes have occurred since the products that are listed in the "Applies to" section were originally released. The update that this article describes is a cumulative update rollup that includes all the changes that were previously released in Microsoft Knowledge Base KB articles , , and For more information about how DST changes may affect other Microsoft products, visit the following Microsoft Web site:.

Update cannot be installed as a newer or same time zone update has already been installed on the system. This message indicates that you have already applied the correct update or that Windows Updates or Microsoft Update has automatically installed this update.

No additional action is required to update the Windows operating system software. The following files are available for download from the Microsoft Download Center: Download the Update for Windows Server package now. Download the Update for Windows Server x64 Edition package now. Download the Update for Windows Vista package now.

Download the Update for Windows Vista for xbased Systems package now. Release Date: November 27, For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

The following changes have been made since the previous Windows cumulative time zone update. Security update replacement information This security update doesn't replace any previously released update. Need more help? Expand your skills. Get new features first. Was this information helpful? Yes No. Thank you!

Any more feedback? The more you tell us the more we can help. Can you help us improve? Resolved my issue. Clear instructions. Easy to follow. For products that are no longer under Mainstream support, these non-security updates will only be offered to customers that have an Extended Hotfix Agreement.

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