Disable SBS 2008 Outlook Autodiscovery
Posted on 2009-07-16
We have SBS 2008 deployed and functional. We are migrating to a Hosted Exchange environment and would like to eventually get rid of the SBS box. Luckily the migration process can be done a few users at a time and we don't have to pull the plug on everyone at once. We already have 2 users setup on the Hosted Exchange and everyone else is still on the internal SBS Exchange. (The users who have been migrated have their mail forwarded to their new Hosting account so internal mail still gets sent/received like it needs to.) This partial migration brings me to my problem.
SBS 2008 automatically configures domain accounts' Outlook client for them. Although I can change that configuration manually, it tries to "fix itself" every time the user opens Outlook. Outside of the domain network things are fine. We have a service record in our DNS pointing to the new Hosted Exchange and the autodiscovery actually works really well from the outside. But inside the domain the user gets an authentication request every couple of minutes from Outlook trying to talk to the SBS machine and reconfigure Outlook. As long as the user knows to ignore these messages their mail continues to work, but if they authenticate even once, the SBS does its job and Outlook gets reconfigured for the SBS, their OST cache changes, things re-sync, and I have to go back and fix them all over again.
So here's the question... how can we disable (even temporarily until everyone gets changed over) the autodiscovery on the SBS machine so that users keep their manual configuration? I'm not sure where SBS 2008 stores its settings for the autodiscovery and I want to make sure that changing it doesn't mess with any other SBS functionality. I know that changing settings outside of the SBS Wizard interfaces can cause problems (like changing your IP without using the wizard... etc...) so I want to make sure that it is the "recommended" procedure for SBS, not just Exchange 2007 in general. If you need any more information just ask. I have full domain admin access to both the Hosted Exchange account and the SBS 2008. Thanks!