Short background to understand the problem:
Because our division on our company has been bought by another company we are migrationg only our OU in the AD to our new companys exchange server. the mailboxes has been exported and imported into the new domain and we have gotten new usernames and passwords on the new companys domain.
While we are in the middle of the migration process, we are still physically on the old companys domain and infrastructure and will be for at least 30 days more. the same is with our mail addresses and domain names. I am the test rabbit for this migration and I have set up my old mailaddress as an alias and send as address in my new mailbox and having the original mailserver forwarding all mail to the new server.
Since I have the same mailaddress as I have on the old server sitting in the old companys infrastructure. Outlook autodetects my mailaddress and changes the setup back to the old mailserver every time I start Outlook. I can not shut down the autodetect for the rest of the old company, and I cannot change the send as address on the new server for at least 30 days.
I have created a local XML file that forwards the setup request to the new server, but as long as I am inside the old domain i have so far been unable to force outlook to search locally for the setup xml when it detects the old settings in the AD first.