I have been using Windows 7 for a while now without many problems. One problem that I was really annoyed with is that Microsoft has not yet created an installation package for Windows 7. After some trials and tribulations, I have found the solution. This works for both 32 and 64 bit OS’s
1) Download the Exchange System Manager for Windows Vista here. Also download and install (if you haven’t done so yet) the Remote System Administration Tools for Windows 7 here
2) Extract the ESM package to wherever you want. After the package is extracted, do not try and open the .exe yet – you will get an unfortunate “You need to be running Windows Vista” error message and you cannot continue with the installation
3) Open up an administrative Command Prompt and type ESMVISTA.MSI /qb
4) After you have completed the above steps, you should now be able to edit Exchange items in the ADUC, or directly with the ESM.
Sources: The Lazy Sysadmin
Brad Laszlo is a Systems Engineer for Prestige Technologies, reigning from Michigan. Brad is specialized in server configuration and manipulation using both Microsoft and Linux technologies, and considers himself to be a novice tech writer (and Bio writer). Brad can be reached at bradlaszlo[at]prestigetech[dot]com or by visiting http://www.prestigetech.com 
Excellent work, All good. Thank you Brad
This worked so perfectly! Thank you thank you thank you
Your solution only half works. It will not run on Windows 7 64bit.
@Edward: Not true… It works perfectly on Windows 7 x64, including Service Pack 1. That is the Operating System I use and the one used when writing this article. Please give it another try – make sure to follow the steps above perfectly.
Are you getting any errors or warnings? Did you run the command prompt as an administrator?