Thanks for the information!  I will send it on to the server administrator.

 Another note though, through testing time and time again, I set up an Exchange profile for another user on the exchange server on their laptop, and the security warning did not come up.  The error also did not occur on their desktop.  Both systems were using Windows Vista Home.  The user requested the laptop be upgraded to Windows Vista Ultimate.  Since the new version of Windows Vista Ultimate that was purchased included service pack 1, I was required to upgrade the existing installation of Windows Vista Home to Service Pack 1 as well.  After Service Pack 1 was installed on the Vista Home laptop, the security warning appeared.  The desktop which was still running the version of Vista without Service Pack 1 did not have the security warning.

Also, I had to download the Service Pack 1 file from the Microsoft download website because the option to install it through Windows update was not available.  Microsoft often blocks updates on systems where there is a known conflict.

 
This lead me to 2 conclusions: Service Pack 1 causes the error on the client side, and Microsoft must be aware of the problem.  Thankfully, the security warning is more of a nuisance than a performance problem.  I would hope that there will be a fix in the future.

In the meantime, we will apply your solution.  Thanks again!