You want to know which DC ESM is using to retrieve and display information from Active Directory, or you want to control which DC it will use.
To see which DC Exchange System Manager is using:
Download, install, and launch Process Explorer from http://www.sysinternals.com.
The Process Explorer window has two panes. In the top pane, on the left, there's a list of all processes running on the local machine. Expand the explorer.exe process.
Expand the Explorer and you will see a process called mmc.exe and the ESM icon (see Figure 3-1).
Figure 3-1. Process Explorer, showing the MMC process selected
Double-click mmc.exe. Open the TCP/IP properties tab, as shown in Figure 3-2.
Figure 3-2. The TCP connection from this MMC session shows the DC in use by ESM
The Remote Address column will show the name of the DC that ESM is using (in this case, batman.robichaux.net).
To choose the DC that that ESM uses, do the following:
On as computer that has the Exchange System Manager
installed, select Start→ Run, then type
mmc to launch the MMC
Choose File→ Add/Remove Snap-in, then click the Add button.
From the list of snap-ins shown in the Add Standalone Snap-in window, select Exchange System and click ...