I went through the process of upgrading my Commerce Server 2007 sites today.  While I had a few issues with the installation, I was able to get everything updated and functioning.

There are really two parts to the SP1 installation: the first is the installation of SP1 itself, and the second is the upgrade wizard that must run against your Commerce Server 2007 sites.  This post will walk you through the installation of the service pack itself.  The upgrade wizard walkthrough is discussed in a separate post.

Before you install Service Pack 1 for Commerce Server 2007, I recommend you do the following:

1. Test SP1 by installing first in your development environment.  Ensure that your application continues to function.  If necessary, run regression tests against your application to make sure nothing has been broken.
2. Install SP1 in your QA or UAT environments, followed by your Stating environment (if you have one).  Again, this is to ensure that your systems are not broken by the installation of the service pack.
3. Make sure to thoroughly back-up your production environments before you upgrade.  This is VERY important, as you must ensure that you have an exit strategy, should something go wrong.  Do not neglect this step, or you may regret it.

Okay, that said, you must first download SP1 before you can begin.  You can download SP1 for Commerce Server 2007 here: http://www.microsoft.com/downloads/details.aspx?FamilyId=748049C5-A9BF-4AEC-91A0-AFE2DE0BF860&displaylang=en

(Note: I created this walkthrough, along with verbose screen shots and text, largely for documentation I am delivering to clients.  Please feel free to use these screen shots and/or text for your own documentation.)

Once you have downloaded the file, you can begin the following steps:

1. Double-click "CS2007-SP1-ENU.exe".  You will receive a security warning - click Run to continue.
   
   
   
2. Specify a location to unzip the necessary files, and click Unzip.
   
   
   
3. Browse to the location you unzipped the files and review the ReadMe.htm file.
4. After you have read the ReadMe.htm file, double-click SP1Setup.exe to launch the installation wizard.
5. On the CS 2007 SP1 Installation Wizard starter screen, click Next to continue.
   
   
   
6. Read the license agreement, specify that you accept the terms, and click Next to continue.
   
   
   
7. Click Next to begin the installation.
   
   
   
8. A dialog box will indicate that various services will be stopped.  Click OK to acknowledge and continue.  The installation of SP1 will (finally!) begin.
   
   
   
   
   
9. Once the installation is complete, a summary page displays.  You can take a look at the log file (which I would recommend) and can also immediately launch the Commerce Server Upgrade Wizard (which I would also recommend).  Click Finish to complete the Commerce Server 2007 SP1 upgrade.
   
   

At this point you must upgrade any Commerce Server 2007 sites you have installed on the machine.  I will discuss this process in a separate post.  I have two recommendations for you at this point:

• Immediately upgrade all of your Commerce Server 2007 sites.  If you don't upgrade them, you will get errors like the following (notice that I learned this out of experience):
  
   
  
• Wait to reboot your server until you have upgraded all of your Commerce Server 2007 sites.  See my post for more details.

I hope this helps!  Best of luck!