We have a legacy VMware Server connecting to an NFS datastore that runs two Exchange 2007 servers (edge + hub) on Windows 2003. We are a small org with about 50 users.
We're in the process of moving everything off VMware Server and onto VMware ESXi.
At the time it seemed like flat preallocated disks were preferred for virtualized Exchange instances, but I've noticed that ESXi defaults to thin provisioning for
vmdks on an NFS datastore. That has me wondering, which do I use when I convert this machine, thin or flat?