http://blogs.technet.com/b/askperf/archive/2011/08/26/troubleshooting-memory-issues-on-exchange-when-using-3gb.aspxHi all, Windows Server 2003 x86 systems running Exchange require the use of the /3GB switch in the boot.ini to ensure that there is plenty of address space available for the Store.exe process. In brief, the /3GB switch is used to provide more virtualen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/askperf/archive/2011/08/26/troubleshooting-memory-issues-on-exchange-when-using-3gb.aspx#3463975Tue, 08 Nov 2011 19:36:39 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3463975Andre Favoretto<p>Great Post Tim! &nbsp; &nbsp;On a few months ago, during a exchange server 2003 troubleshooting memory issue, we had found that system was run with lower free PTE&#39;s.. changing 2900 from 2970 resolved the issue.</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3463975" width="1" height="1">http://blogs.technet.com/b/askperf/archive/2011/08/26/troubleshooting-memory-issues-on-exchange-when-using-3gb.aspx#3450009Tue, 30 Aug 2011 13:04:08 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3450009Daniel Noakes<p>I have found disabling unused network and HBA ports help with NPP, as well as comparing usage under different driver versions to scale Exchange 2003 clusters very high.</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3450009" width="1" height="1">