As everyone is probably already well aware, Microsoft has released a daylight savings time (DST) patch for its Windows operating systems. The patch is required to comply with the new start and end dates for DST as specified by the Energy Policy Act of 2005. The change goes into affect this spring, and IT administrators everywhere are scrambling to make sure their servers are updated.
DST Patch and Exchange Server 2003
Here we will be dealing specifically with the DST patch for servers running Exchange Server 2003 SP2.
The patch ID is KB926666 and can be downloaded from: http://www.microsoft.com/downloads/details.aspx?amp;amp;amp;amp;amp;displaylang=en&familyid=C16AEA4A-ED33-4CD9-A7C3-8B5DF5471B7A&displaylang=en
NOTE: This is not the Windows daylight savings time patch, but a supplemental patch for Exchange. Before you apply this patch you should first download and install the appropriate DST patch (KB931836) for your operating system: http://support.microsoft.com/kb/931836/
Here are some of the highlights of what you should know about this patch:
- Make sure to first install the main DST patch (KB931836) as mentioned above.
- This patch cannot be installed on Exchange Server 2003 SP1 or Exchange Server 2000. You must first upgrade to Exchange 2003 SP2.
- Exchange Server 2007 does not require this KB926666 patch.
- You do not have to restart the Windows server after applying the patch. However, the Exchange Server Information Store service and any dependencies will be restarted.
- This patch may cause problems for mobile device users or users configured with shared mailboxes. Email messages either cannot be sent, or are sent but result in a Non Delivery Report (NDR). Administrators who have users with these configurations should reference Microsoft article KB912918: http://support.microsoft.com/kb/912918/
Why Do I Need This Patch?
The DST patch for Exchange should be considered mandatory. All Microsoft calendar applications, such as Outlook, depend on time information from the operating system. However, other programs that are based on Collaboration Data Objects (CDO), such as Microsoft Outlook Web Access, depend upon separate time zone tables. This patch modifies these tables to match the changes to the time zone settings of the OS. If the patch is not applied, the CDO-based applications will not be aware of the DST change, and will be out of sync with the actual time.