I am recommending to my customers that they not install the Windows patches for DST 2007 available at http://support.microsoft.com/kb/928388 until later.  If you read http://office.microsoft.com/en-us/outlook/HA102086071033.aspx you will see the following:

"Microsoft has incorporated a new feature into Microsoft Office Outlook 2007 to help adjust calendar items affected by time zone changes. For other releases of Outlook, Microsoft will release an Outlook Data Update tool. This tool is tentatively scheduled for release in January 2007; this content will be updated when it is available."

That tool (Outlook Data Update) is not out yet (1/19/2007).  If you deploy the Windows DST 2007 patches and don't have the tool to update your appointments you may see appointments that seem to be incorrect.  For now, I would wait until that tool is out.  Also, we will have more information available at that time.

 More information in general about DST 2007 can be found at:

http://www.microsoft.com/windows/timezone/dst2007.mspx

http://support.microsoft.com/gp/dst

http://support.microsoft.com/kb/928388 

What functionality would you lose if you ran Outlook 2003 against an Exchange 2007 server instead of running Outlook 2007?
http://www.microsoft.com/exchange/evaluation/featurecomparison.mspx

It looks like you would not have the following (listed in my order of preference):

• Super fast search capabilities (my favorite)
• Scheduled OOF
• External OOF
• Scheduling assistant
• Other features that corporations love like: AutoDiscover, Partial Item download, Managed folders...

Some of the features above are available via OWA 2007 however. 

Today, Microsoft posted some much awaited information about the steps that will be necessary for Exchange Server, the Operating System, Windows Mobile, and Outlook clients.  You can find it here:
http://www.microsoft.com/windows/timezone/dst2007.mspx

The good news is that Windows Vista, Outlook 2007, and Exchange 2007 have the fixes in them.
The bad news is that chances are that you are not running any of those... 

The good news is that if you are running Exchange 2003 SP2 you can get a fix...  Soon.
The bad news is that if you are running Exchange 2003 SP1... you will need to go to SP2.  Ok, that probably is good news.
But...  If you have been holding off on installing some fixes because of the "Send As" changes, well...  We updated the store.exe on this fix and it includes the "Send As" fix, so you are going to want to get your users configured correctly if you haven't yet already.  See http://support.microsoft.com/kb/912918/en-us for more information.

I kid about this because it is going to probably hurt.  I know that this will be somewhat painful for some of our larger customers.  Fortunately, it looks like the product groups have done some good work in getting this information together.  Please take a look at the first article for steps on how to make this as smooth as possible.

In the interest of being open about it...  I am submitting this blog post right now using a Microsoft provided laptop and it is running Vista.  There, I said it.  Whew!  I feel so much better now that I have it off my chest.

Some other things I should probably point out:

• It is NOT an Acer Ferrari laptop, but I wish it was.
• I had to load Vista on it myself.  In fact I have loaded Vista (Beta tester builds) on it too many times to keep count.
• I am NOT going to give it away to some lucky reader of this blog.  That would be mean since I wouldn't wish this old laptop on anyone else.
• It works fine.  I know that isn't a statement that marketing would like to hear.  They probably would like me to gush on and on about how cool it is and how my job is so much easier than it was before I put Vista on it.  But...  It works fine.  There are things that I really like about it.
• Ok, I'll go a little further.  It works so well that I had to upgrade my home machine because I missed some of the features that I had at work.
• I like it better than my former Apple iMac.  I sold that and used the money from it to buy a Dell. 
• My Zune is working fine as well, on Vista.