Within a VMware ESX Environment, they do not alert you when DRS moves a VM to a different host. You would have to set DRS to manual, or set an exception for the Exchange server. With that said, if you initiate a VMotion, you would then have that logged. You could troll the vCenter Server logs, but that is also difficult. There isn’t an easy way to determine when VMware moves a host around.
You can, within VMM and OpsMgr alert on Live Migration Completed, so if the VM was running on Hyper-V, you can monitor the logs to alert on when a Live Migration happens. You may be able to do this if using our PRO tips to manage the movement of ESX Server VMs as well.