Hi, I'm going to develop a new Exchange 2007 just for a test. I've done as bellow. Windows 2003 SP1 Installing SP2 Updated from Microsoft Website Promote PC to Domain Controller Installing Resource Kit and Support Tools Installing .Net Framework 2 + SP1 Installing Windows Power Shell (WindowsServer2003-KB926139-v2-x86-ENU.exe) Installing Windows Installer 4.5 Raising Domain and Forest Functional Level to Windows 2003 Installing SP2 again After theses steps I've ran Setup.com /prepareschema and the setup generated this messagea and it stopped: Exchange Server 2007 requires Microsoft Command Shell. Please visit "http://go.microsoft.com/fwlink/?linkid=64456&clcid=0x409" to download and install it. There is not any entry for WindowsServer2003-KB926139-v2 under windows 2003 Updates but the PowerShell is working properly. Any idea?

Are you installing Exchange 2007 SP1? If so, this only supports PowerShell v1, and it looks like you have PowerShell v2 installed.

It seems you are installing Exchange 32-bit version evaluation version the prequisite for this version is Microsoft Command Shell but not power shell Just download & install it .This version is just for testing not for production

Thank you all. I found that the Exchange 2007 was Beta version. I downloaded the new version from Microsoft web site. It's working properly.