I'm running Windows 2003 Standard with Exchange 2003 32 bit. I have 4 GB's of RAM in my server. I recently optmized the memory settings for my Exchange 2003 backend server. All event ID's pertaining to non-optmized memory have gone away. What I did notice is that my system is only using a total of 1.6 GB's of RAM. The store.exe process if only using 1.03GB's of RAM. I have 65 users on this server and the total private info store size is 55 GB's. Shouldn't Exchange be utilizing more memory? Should I force the store.process to use more memory?