Configuring Free/busy across forest is always a typical task to do.
But Creating Federation trust became much easier to share free busy across forest as a permanent solution
Still some scenarios require Exporting Free/busy to the other forest to build a coexistence between forests.
Lets see how to do it.
There are some other methods where we can configure Cross forest Free/busy without Active Directory trust, which will be covered in later posts
when target Forest resolves the Source domain for Free/busy it should resolve “Autodiscover.CareExchange.in” to your source forest client access server
I am try to do a Test email auto configuration from (TargetForest) CareExchange.in to a Mail Contact ”Galsync1@careExchange.in”
you can see “Autodiscover.CareExchange.in” resolves through DNS to the Source forest Client Access Server
In my case , I have Configured DNS forwarders from Target DNS server Forwarding my unfulfilled requests to Source DNS server,Where I have a HOST A record in the source domain already “Autodiscover.careexchange.in” Resolving to my source Exchange Client access server
Once That part is done.
You can use a GALsync to have your Mailboxes synced from source forest(Careexchange.in) as contacts in the Target forest (TargetExchange.in)
You can use ILM,FIM 2010 or you can use 3rd party NetSec Galsync which will get your the contacts synced from Source to Target.
Now you got to add your AvailabilityAddressSpace on the source forest
Run the Below Command on the Source Forest
Add-AvailabilityAddressSpace -ForestName TargetExchange.in -AccessMethod PerUserFB -UseServiceAccount $true
Giving “ms-exch-epi-token-serialization” permission to the Source Exchange Servers over the Target Forest
Run the Below Command on the Target Forest
Get-ClientAccessServer | Add-AdPermission -AccessRights ExtendedRight -ExtendedRights "ms-exch-epi-token-serialization" -User "CareExchange\Exchange Servers"
Run this command in the Source forest (CareExchange.in) to export the SCP from the Source forest to the Target forest
So that the Target forest will have the Free busy information of the Source forest
Save the Credentials of the Target forest.
Please Type “DomainName\Username” and Password
Export-AutodiscoverConfig -TargetForestDomainController "Targetdc.targetexchange.in" -TargetForestCredential $Target -MultipleExchangeDeployments $true
Now Autodiscover information has been Exported from from source forest(Careexchange.in) to the Target forest (TargetExchange.in)
Now able to use autodiscover & Access free busy without any issues