Hi Matt
Thanks for your reply. Initially I was wanting to clone the existing Exchange 2007 Cluster so that OS and Exchange versions remain same. However after looking around a bit, it looks like cloning existing cluster is a bad idea for the reasons that you have mentioned.
Few articles suggests setting up new VMs and then migrating mailboxes to new setup. I can possibly set up new VMs with Windows Server 2008 R2 and Exchange 2013 and migrate the mailboxes.
What would be the best approach? Could you please share some links on this??
Thanks
MK