If the Windows 7 computers are in a production environment, I would recommend waiting for the official release that will be supported with this version of the Operating System which I believe at the moment is MR5. I have heard that Windows 7 is due to be released on October 22, 2009, but of course the date could be earlier as well as later. Remember, until the official release of Windows 7 is released from Microsoft, any users running Windows 7 now would be running a beta version of the software and would be subject to code changes before the official release of the product. However, you are free to test MR4 MP2 on Windows 7, but since the OS is beta, any issues you run into would not be supported.