The Exchange management shell is a part of the management tools for Exchange. Microsoft does not support running Exchange Server 2007 on a 32-bit version of Windows in a production environment. An exception is made for the Management Tools, as documented in the "Exchange Server 2007 System Requirements".
Install only the 32-bit version of the Management Tools on the gateway machine. Installing the 32-bit version of the tools on a 64-bit version of the operating system, or installing both versions of the tools can lead to unpredictable behavior.
The 32-bit version of the management tools can be downloaded from the Microsoft website:
The version of the tools you download and install should correspond to the Exchange Server 2007 version installed in the rest of the Exchange environment.
Before starting the installation of the management tools make sure that Microsoft Windows PowerShell 1.0 and Microsoft .NET 2.0 Framework
the two required packages have been installed:
Microsoft Windows PowerShell 1.0
Microsoft .NET 2.0 Framework