Exchange 2010 Resource Forest - Autodiscover

Question

Environment:
Account Forest (No Exchange server installed)
Resource Forest (Exchange 2010 SP3)
I understand that a SCP record can be created in the account forest using the following command:  Export-AutoDiscoverConfig -DomainController <FQDN> -TargetForestDomainController <String> -TargetForestCredential $a -MultipleExchangeDeployments
$true
Questions:
1.  Do I need to prep the schema in the Account Forest to create the relevant Exchange configuration before running Export-AutoDiscoverConfig?
2.  Is the switch MultipleExchangeDeployments $true needed?  Technet states that it's only needed if both forests contain Exchange but also states it's needed for
multiple accepted email domains? (which we do have) 
http://technet.microsoft.com/en-us/library/aa998832(v=exchg.141).aspx3. 
3. Can this change be backed out.  i.e. can the SCP record be removed by using ADSI edit.
Thanks in advance

Answer 1

Hi,
Here are my answers you can refer to:
1. It depends.
If Exchange deployment has two or more trusted forests, you must update Active Directory so that Outlook users in one forest can access the CAS servers in the remote (or target) forest to use the Autodiscover service. To do this, we must extend the schema in
the user forest by running Exchange 2010 Setup with the /PrepareAD or /PrepareSchema switch, and then run the Export-AutodiscoverConfig cmdlet in the resource forest that contains the Client Access servers that provide the Autodiscover service against the
target forests.
If you do not want to extend the schema in the user forest, you can update DNS in the user forest with a host record that points to the internal IP address of the Client Access server in the resource forest where Autodiscover is hosted.
For more information, you can refer to the following article:
http://www.testlabs.se/blog/2010/11/06/configuring-the-autodiscover-service-for-multiple-forests/
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make
sure that you completely understand the risk before retrieving any suggestions from the above link.
2. It doesn’t need in your environment.
When the parameter MultipleExchangeDeployments is set to TRUE you will tell the forests that you have multiple Exchange forests. The parameter will also export the accepted domains which are defined in the Exchange environment.
3. SCP record can be removed by using ADSI edit:
On your account domain, open adsiedit.msc, locate the SCP records in 
CN=Autodiscover,CN=Protocols,CN=<CAS_SERVER>,CN=Servers,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=<ORG>,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain,DC=com
For more information, you can refer to the following thread:
http://social.technet.microsoft.com/Forums/exchange/en-US/a06686ec-f1dc-4738-b4c5-76c41088e145/configuring-autodiscover-in-resource-forest?forum=exchangesvrdeploylegacy
If you have any question, please feel free to let me know.
Thanks,
Angela Shi
TechNet Community Support