There is a high ram usage by store.exe. I searched on web about the solution and found that there is a patch that fix the problem and reduce the usage of store.exe. But for that I want to find out which version of Exchange I am running. The patch that I had download supports Exchange 2003. I am not sure what I am using. It may be Exchange 200 also. I went inside the System Manager where I found About Exchange and on that it was mentioned some :6.5.6944.0. Should I apply the patch.