Ali is having a total nightmare with the changes to Daylight Savings time in the US and mailed me for help, so I started digging around for information. We'd mentioned DST in our last TechNet newsletter (register here by the way). Here's what we said...
"Finally, we're only a couple of months away from Daylight Saving Time (DST). DST starts three weeks earlier this year under the new Energy Policy Act passed by US Congress in August 2005. While the change applies to U.S. and Canada, it may impact customers based outside North America. Several Microsoft products are affected so updates to these products are being developed and tested. Some of them are currently available, with the remainder scheduled to be released from December 2006 through early March 2007. Find out how to prepare for changes in DST in 2007."
Well, this isn't really enough information to help you get everything up to date. Ali had been receiving differing information from different contacts throughout Microsoft. So I asked my mate Paul, who had blogged about a similar issue with BlackBerry's the other day. And he did some digging too and came up with a huge amount of resources that you need to be aware of.
As Paul says:
"Outlook is looking like it's going to be a pain in the butt. The problem is that when you apply the Windows Operating System Update for DST 2007 you will have Outlook calendar appointments off by 1 hour during the DST Change periods.
The solution requires three things to be in place for Outlook calendar items to be updated properly.
- The Operating System update to change the time zone information. 928388 or 914387 (available now).
- The Exchange Server 2003 Update for CDO. 926666 (available now).
- The Outlook Time Zone Data update Tool and the Exchange Time Zone Update Tool. (not released yet).
If all of these patches and tools are not used together, then there will be calendar inconsistencies. If you install update 928388 or 914387 for the operating system without doing anything else, users are notice that the meetings during the DST change periods are ahead by 1 hour. This is expected behavior without installing the Exchange server hotfix 926666 patch and using the Outlook or Exchange tool to rebase the appointments that are in the DST change period.
The Outlook tool is due to be released in January 2007 through the Microsoft Download Center that can update calendar items in Outlook to accommodate the changes in DST during the Extended DST period. This program is called the Time Zone Data Update Tool for Microsoft® Office Outlook® (Time Zone Data Update Tool).
Microsoft Office Outlook 2007, the newest version of Outlook, has the ability to automatically detect the DST change and prompt the process that updates a person’s calendar to conform to the new daylight saving time rules. However, the Time Zone Data Update Tool contains enhancements that improve upon what is available in Outlook 2007and should be run instead of the out-of-the-box Outlook 2007 experience."
This isn't the definitive way to solve all of your problems, but its a heck of a long way down the road to a solution.
P.S.. We've been kicking around the idea of changing DST in the UK for years now, so by the time you've sorted this out, we may have decided to implement, and you'll have to go through all of this again. Oh happy days...