We are in the process of moving completely to a new domain, including a new Exchange server. Though I have successfully migrated an Exchange account, the Free/Busy data did not migrate with the user. If someone can provide any assistance, or even the steps on how to migrate an Exchange user, including their Free/Busy data, it would be greatly ap

Hi Robert 

By using the Add-AvailabilityAddressSpace commandlet which has been introduced from Exchange 2013 we would be able to share the exchange free busy data between 2 forests.

We need to have a trust relationship between the source forest and target forest to execute this command. Only then the below command will be successful.

You can follow my write up on the same which will help you for sure 

http://exchangequery.com/2014/11/10/steps-to-configure-cross-forest-availability-between-two-exchange-forests-in-exchange-2013/

Hi Sathish,

Thank you for the quick reply. So, I already had a Trust Relationship in place between the two forests. So, I am following your article and I have ran the following commands so far:

1. Add-AvailabilityAddressSpace -ForestName toybox.com -AccessMethod PerUserFB -UseServiceAccount $true
2. Get-Exchangeserver | Add-AdPermission -AccessRights ExtendedRight -ExtendedRights ms-exch-epi-token-serialization -User ExchangeQuery.com\Exchange Servers

Both ran successfully. Are they the only two commands on that page I need to run? The remaining part of the article appear to be for the scenario where there is not a Trust Relationship in place.

HI Robert

You need to run the other commands as well to export the SCP objects of the source and the target vice versa

Hi,

I noticed you ran the command Add-AvailabilityAddressSpace,and you should also export the SCP from the target forest to the source forest using the below command .

Export-AutodiscoverConfig DomainController LocalForestDomainController -TargetForestDomainController "(toybox.com)" -TargetForestCredential (Get-Credential) -MultipleExchangeDeployments $true

Note use your target forest to replace Toybox.com.

For detailed steps about the migration,  please refer to the following article that tell us how to configure cross-forest availability between two exchange forests.

http://blogs.technet.com/b/exchange/archive/2011/03/04/how-to-configure-the-availability-service-for-cross-forest-topologies.aspx

http://social.technet.microsoft.com/wiki/contents/articles/28332.steps-to-configure-cross-forest-availability-between-two-exchange-forests-in-exchange-2013.aspx

Best Regards,

David