Outlook client PC and MAC stopping client autodiscover

Is there a way for the Outlook 2010 client and the Outlook for Mac 2011 from using autodiscover? Can this be disabled from the clients.  We are in a transition from one Exchange org to another.
hbpubAsked:
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Brad GrouxSenior Manager (Wintel Engineering)Commented:
Outlook will try to autodiscover regardless of what is done on the Exchange side because autodiscover is hardcoded into AD...  the Service Connection Point [SCP] is created during installation of the CAS role.

The only real way to disable this would be to hard-code the XML file and modifying the autodiscover default behavior. This TechNet blog post takes you through the steps - http://blogs.technet.com/b/ilvancri/archive/2010/02/03/some-autodiscover-fun.aspx

Autodiscover GPOs - http://support.microsoft.com/kb/2612922/en-us
Autodiscover Overview - http://technet.microsoft.com/en-us/library/cc511507
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hbpubAuthor Commented:
Maybe this is not the solution.  I will explain what is happening.  We have two Forest and they have there own exchange.  We are migrating from Forest/Exchange A to Forest/Exchange B.  One of the problems is we are using an email domain that "A" is not the owner and it is owned by "B".  IT Group from "A"  saw this as something that could cause potential issues.  So the process for "A " to use this email address as  primary for set as reply we have mailbox create on "B" which forwards to a secondary email address of the user on "A".   Now the organization has changed and we have to migrate the users on "A" to "B". To accomplish this they are using quest tools and setup a conditional forwarder from "A" AD DNS for the email domain in question.  We are seeing a few users whose outlook client PC and Mac versions that use this email domain and have not been migrated over to "B", change it's setting to the "B" exchange.  Now this won't happen to others users who don't use this particular email domain.
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