I have a exchange 2003 server running on windows 2003 enterprise edition currently having 512MB of RAM. i am want to add 1GB of RAM to the machine. it will be having 1.5GB of RAM in total. we will add more RAM later. Do i need to add the /3GB switch to the boot.ini file for better performance or should i let exchange 2003 manage the memory tuning process, as the total memory size is more than 1GB. i need a explanation on /3GB switch and how to tune the memory on exchange 2003 server with 1.5GB of RAM. Any help will be appreciated. Thanks..