/3 Switch on SBS 2003 [optional tweak] KB 823440
Use of the /3GB switch in Exchange Server 2003 on a Windows Server 2003-based system:
http://support.microsoft.com/default.aspx?kbid=823440
PLEASE NOTE - AT THIS TIME WE ARE NOT RECOMMENDING THIS ADJUSTMENT
Do we use the /3 switch or not?:
http://msmvps.com/bradley/archive/2004/07/26/10713.aspx