When install a Exchange 2007 or Exchange 2010 Server on vSphere there are some settings that will increase de performance.
– Use de VMXNET 3 Adapter
– Use per Disk a SCSI Controller
– Store the Log & Database files on physical Lun on a SAN
– Use the LSI LOGIC SAS controller for Windows 2008 & 2008 R2
– Use the VMware Paravirtual SCSI (PVSCSI) Controller for Every physical Raw Device Mapping (RDM).
Another TIP. Exchange 2007 & Exchange 2010 needs a lots of Memory. When choosing the size for the OS partition, swap file need also al lot of space.