We are migrating from Exchange 2007 to Exchange 2013. We have a new Exchange 2013 server will all of the roles installed, but none of the mailboxes have even been moved yet. We are seeing some of our users getting prompted to accept the self signed certificate on the exchange 2013 server. Exchange 2007 server is still handling all of the mail flow and connectors. Any reason why some of our users would be prompted with the certificate for the exchange 2013 server even though their mailbox is still on exchange 2007. Our users are on outlook 2010.
Ed
Ed