A word of caution: You might have seen the occasional Windows Server
deployment in which there was a /3GB switch used in the server’s BOOT.INI
file. The /3GB switch changes the memory allocation so that Windows is only
allocated 1 GB of address space, and user mode processes are allocated 3 GB
of address space. Splitting the address space like this helps Windows to
better manage high demand applications such as Exchange Server. However,
Windows is configured to have a 2 GB address space for the operating system
for a reason. If you use the /3GB switch, you can severely impact Windows
ability to run multiple applications simultaneously. Furthermore, you should
never use the /3GB switch on Small Business Server or on a domain controller.
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