Sharing Resources and Global Address List between 2 trusted domains

Hello, I have two domains with a 2 way trust and I am looking for a way that users on both domains can book resources in the other domain (respectively).  I also need to share the GAL.  Is this possible without MS Identity Lifecycle Manager?  One domain is a 2008 domain, the other an 03 domain.  Both Exchange systems are Exchange 2010. Kindly advise as to what other information I need to provide.

Thank you!
SimradOptronicsAsked:
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SimradOptronicsConnect With a Mentor Author Commented:
We are going to use a 3rd party sync program as you have suggested.  Thanks everyone.
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endital1097Commented:
if the two exchange organizations are not in the same organization you cannot share resources without something like GALSynch (ILM)
you need to have the meeting request be received wherever the mailbox resides so that autoaccept maintains the free/busy
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endital1097Commented:
that sounded terrible
if the two domains are not in the same exchange organization...
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sunnyc7Commented:
endital is right
If you dont want to go ILM way, there's another tool which does this job.
http://www.netsec.de/en/products/galsync/


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SimradOptronicsAuthor Commented:
Hi Thank you for your reply.

I found this article about setting up a Federation between external Exchange 2010 organizations, it looks like it will solve our issue.

 http://technet.microsoft.com/en-us/library/dd351109.aspx

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Tommy_CooperCommented:
How many users do you have? Is it practical to create contacts in the target domain for every mailbox you have in the source domain? This could be simply scripted using EMC/powershell.
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endital1097Commented:
The federation allows you to share free busy across organizations. It does not allow for auto accept
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SimradOptronicsAuthor Commented:
We have roughly 170 Users in one domain, and about 75 in the second. Not sure if manually making the lists will work.
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sunnyc7Commented:
I think you should consider ilm if you have that many users.
Atleast you will have a solution that works with documentation, rather than going about the whole process in a trial and error fashion
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jimjohnstonCommented:
ILM/FIM/IIFP will do your GALSync,  IIFP product support was extended and will provide the basic GALSync functionality at no cost.  We do not sync free/busy as part of the GALSync.
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