This post discusses “Exchange 2007 memory consumption and why Exchange uses so much of the paging file?”. Well, there are some valid reasons why and some misconceptions that need to be corrected.
Comparing memory usage between Exchange 2007 and Exchange 2003: First, let's start with why Store.exe uses so much RAM. If we take a step back in time to the Exchange 2003 era, this blog was quite active on how to tune memory on an Exchange 2003 server. I am not going to go in to specifics or great detail, but one thing to call out is that on the 32-bit architecture, we were limited to addressing 4GB of virtual memory on any given server. So essentially, any 32bit program could address up to 4GB of virtual memory. […]