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Whaddya know how to Use of the /3GB switch in Exchange Server 2003 on a Windows Server 2003-based system

A friend of mine is asking on how to use the /3GB parameters to fully utilize the memory management of your Windows Server 2003 to support Exchange Server 2003. It's been a while since my last setup and configuration of Exchange Server 2003 (maybe because I am managing Exchange Server 2007, by the way SP1 for Exchange Server 2007 is out).

When I need to get some information related to Microsoft Exchange Server, I always search it first through website. Yes not Google search. You will get 95% relevant information than searching to Google. Well it's a Microsoft product anyway.

Here's the information I've found on how you can configure your Windows Server 2003 to add the /3GB and /USERVA=3030 parameters.

"After you have installed Windows Server 2003, modify the Boot.ini file, and then add the /3GB and the /USERVA=3030 parameters to the startup line" (2009,
For example:
[Boot Loader]

[Operating Systems]
multi(0)disk(0)rdisk(0)partition(2)\WINNT="Microsoft Windows Server 2003" /fastdetect /3GB /USERVA=3030

There you go, reset your server and run TASKMGR to see improvement to your Exchange Server 2003. Read here for more information.

Other useful links:
- Troubleshooting High CPU Utilization by Store.exe
- Store stops responding with High CPU Usage
- Exchange memory use and the /3b switch
- How to optimize memory usage in Exchange Server 2003
- Large memory support is available in Windows Server 2003 and in Windows 2000


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