I seem to have an unusual problem, after searching and seeing thousands of questions regarding store.exe for Exchange 2003 using too much memory - mine will not use enough! store.exe basically hovers at about 1gb at max. Nothing I seem to do makes it grab any more memory, and the machine it is on has 4GB. I am using the /3GB and /USERVA=3030 switches, but it makes no difference. I am suspicious that the boot.ini switches are not working since the maximum memory used on the whole system seems to climb to around 2.1GB and stop, and nothing but Exchange runs on this server. If the /3GB was working, wouldn't something climb up there?Any advice? I have combed the forums and cannot find anything, although I did encounter one old posting out on google from someone with a similar problem (and not solution).- Dan

You're right, there is something wrong with the boot.ini or system. is there is any specific error pertaining to the memory in application log and system?.I would like you to check the following articles.'How to optimize memory usage in Exchange Server 2003http://support.microsoft.com/kb/815372Exchange 2003 Memory Optimization*http://msmvps.com/blogs/ehlo/archive/2008/01/21/1473984.aspxConfiguring Hot-Add and Large Memory for Exchange 2003 http://msexchangeteam.com/archive/2005/12/14/416065.aspxArun Kumar | MCSE - 2K3 + Messaging | ITIL-F V3