I've just completed a migration of 300 users to Exchange Online from Exchange 2007. I've got an on-prem Hybrid Server (Exchange 2013) along with a DirSync server. I now want to decommission the Exchange 2007 server infrastructure.
The problem is the legacy (Exchange 2003) Email Address Policies on the Exchange 2007 Server. There are several Policies and they are all unwanted including the default Email Address Policy which applies incorrect attributes.
My question is this: Can I simply delete ALL Email Address Policies on the Exchange 2007 server? I can view the policies on the 2013 Hybrid server. They cannot be edited on the 2007 Exchange server without first being upgraded, but I seem to be able to delete them (successfully delete 2 that are known to be obsolete).
I've read TechNet articles about upgrading the Policies but I'm concerned that incorrect attributes will be applied in the process of upgrading. I'd prefer to just delete them. Is there anything I should know before deleting the Default Email Address Policy, or any other Email Address Policy? I assume I can just create a new Default Email Address policy on the Exchange 2013 server once the defunct legacy Policies have been deleted. Is this correct?