I currently have two forests running Exchange 2010. A two-way forest trust is in place and functioning properly. I'm trying to get free/busy to work between both forests by following this article: http://technet.microsoft.com/en-us/library/bb125182.aspx The commands I ran on Forest A were: Get-ClientAccessServer | Add-ADPermission -Accessrights Extendedright -Extendedright "ms-Exch-EPI-Token-Serialization" -User "ForestB.domain.com\Exchange servers" and Add-AvailabilityAddressSpace -Forestname ForestA.domain.com -AccessMethod PerUserFB -UseServiceAccount:$true The commands I ran on Forest B were: Get-ClientAccessServer | Add-ADPermission -Accessrights Extendedright -Extendedright "ms-Exch-EPI-Token-Serialization" -User "ForestA.domain.com\Exchange servers" and Add-AvailabilityAddressSpace -Forestname ForestB.domain.com -AccessMethod PerUserFB -UseServiceAccount:$true Free/busy information still isn't flowing between the Exchange environments. Any ideas?

Do you have contact objects for each other in each forest? The contact objects must exist and the contact objects must be using a different targetaddress.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Thanks for your response. Yes, contacts do exist for each other in each company's GAL and the target address is different.

Did you export each others SCP into AD?James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

No, we have not. Is there a TechNet article on how to do this?

Yes use the export-autodiscoverconfig cmdlet. How to Configure the Availability Service for Cross-Forest Topologies http://technet.microsoft.com/en-us/library/bb125182(v=exchg.80).aspxJames Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Yes use the export-autodiscoverconfig cmdlet. How to Configure the Availability Service for Cross-Forest Topologies http://technet.microsoft.com/en-us/library/bb125182(v=exchg.80).aspxJames Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Thanks for the link. Just to verify, the variable "sourceforest" in the command below would be Forest A in my scenario correct? Does this command need to be ran on both forests? $a = Get-Credential (Type "SourceForest\Administrator") Export-AutodiscoverConfig -TargetForestDomainController "dc.sourceforest.com" -TargetForestCredential $a -MultipleExchangeDeployments $true

That's correct, I ran it in both in my previous deployment.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

This worked. Thank you very much for your help!