Configuring Availability Address space for cross forest - Untrusted Forests

We have used FIM2010 and performed GAL sync of two untrusted forest (Exch 2007 & Exchange 2010)
Now we need to view free/busy info of both forests. I have refered technet articles and found availability addressspace needs to be configured in both the forests.
Please guide me configuring Availability services configuration to be done in both forests.

From the below technet article we need to run the below command in an untrusted forests.
As we have exchange 2007 in one forest and 2010 in other, do we need to run the same shell cmdlet in both forests.

http://technet.microsoft.com/en-us/library/bb125182.aspx


Set-AvailabilityConfig -OrgWideAccount "Contoso.com\User"
$a = get-credential  (Enter the credentials for organization-wide user in Contoso.com domain)
Add-AvailabilityAddressspace -Forestname Contoso.com -Accessmethod OrgWideFB -Credential:$a

Please suggest.
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AhmedAliShaikAsked:
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Exchange_GeekCommented:
$a = get-credential  (Enter the credentials for organization-wide user in Contoso.com domain)
Add-AvailabilityAddressspace -Forestname Contoso.com -Accessmethod OrgWideFB -Credential:$a

This cmdlet needs to be run once in each source forest, for example if forestA=contoso.com and forestB=Paffe.com

You'll need to run the cmdlet in Paffe.com
$a = get-credential  (Enter the credentials for organization-wide user in Contoso.com domain)
Add-AvailabilityAddressspace -Forestname Contoso.com -Accessmethod OrgWideFB -Credential:$a

You'll need to run the cmdlet in contoso.com
$a = get-credential  (Enter the credentials for organization-wide user in Contoso.com domain)
Add-AvailabilityAddressspace -Forestname Paffe.com -Accessmethod OrgWideFB -Credential:$a

However, this is never the intention cause there is always Mail enabled user object on the other forest.

You might want to read to understand the logic behind this sort of setup.
http://briandesmond.com/blog/cross-forest-availability-with-exchange-2007-and-exchange-2010/

Regards,
Exchange_Geek
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AhmedAliShaikAuthor Commented:
Hi Exchange Geek,

Thanks for sharing your knowledge base.

I will run this in our production environment and post you.
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AhmedAliShaikAuthor Commented:
One clarification:

As per the cmdlets provided , do i need to pass the contoso credentials in both forests.

You'll need to run the cmdlet in Paffe.com
$a = get-credential  (Enter the credentials for organization-wide user in Contoso.com domain)
Add-AvailabilityAddressspace -Forestname Contoso.com -Accessmethod OrgWideFB -Credential:$a

You'll need to run the cmdlet in contoso.com
$a = get-credential  (Enter the credentials for organization-wide user in Contoso.com domain)
Add-AvailabilityAddressspace -Forestname Paffe.com -Accessmethod OrgWideFB -Credential:$a

Please advice.
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AhmedAliShaikAuthor Commented:
Hi Exchange Geek,

I have executed the cmdlets in both the forests with the commands provided.
But still we are not able to see the freebusy inf.

Does it takes time to replicate & check the frebusy information.
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Exchange_GeekCommented:
Yes it would take time.

Regards,
Exchange_Geek
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AhmedAliShaikAuthor Commented:
Thanks.
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