I agree but I did not follow the "Migrating Enterprise Vault to 64-bit hardware" document http://www.symantec.com/business/support/index?page=content&id=TECH141481
but instead I used "Migrating Enterprise Vault to 64-bit hardware using the Server Settings" document
http://www.symantec.com/business/support/index?page=content&id=HOWTO42445
and dont recall seeing that i needed to do anything about custom registry changes, I guess I should of when the manual way but I though of given it a shoot with the wizard.
A lot of other issues is going on that made this not a successfull migration:
Custom Registry key not being migrated
"Welcome message" was disable on old servers and now I get warnings 2297 even if the msg are not in the EV folder.
I'm using a certificate for the EV site https:\\vaultserver1.domain.com and it did not get reconfigure onto the new server consequently users no longer have access via Outlook or OWA
After reviewing the following doc TECH175477 while trying to troubleshot my certificate issue. Not sure I needed to enable "Enable 32-bit mode on the EnterpriseVaultAppPool application pool" on windows 2008 r2 the migration wizard did not flag this, but I will check the Installation & Config guide to see if I miss it.
I suspect many other issues exist but I have yet to come accross because of my main one for me now is to get the certicate to be installed onto the new windows 2008 r2 server, so if anyone has any insit in moving my certificate it would help me greatly.