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Cross-Forest GAL and Free-Busy Synch

We are currently an Exchange 2003 domain that synchronizes with an Exchange 2007 installation using SimpleSynch for the GAL and InterOrg for Free-Busy.  The one-way trust is that we trust them.  We are a university and they are a hospital.

We are upgrading to Exchange 2007 soon, and need a replacement strategy for both the functions above.  I have settled on either keeping SimpleSynch (as both parties have a license) or going to IIFP and GAL Synch.  It's the Free-Busy replacement that is giving me a hard time.  It is my understanding that Exchange 2007 does not support InterOrg, except when dealing with an Exchange 2003 installation.

What can I use as a replacement for this, bearing in mind that the best I will be able to do, in terms of trusts, is the one-way that exists now.
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I am using Quest Migration Manager for exchange to perform my Free-Busy and Public Folder synchronization.
I am not sure of a free option.
DouglasMurphyAuthor Commented:
Quest looks to be for migration only...are you using it as an on-going process?  Is your setup similar?  2 forests, with you trusting them, but they not trusting you?  And, are you synching both GAL and Free-Busy?  We have no need for Public Folders synch.

For GAL Sync only, Quest Collaboration Services, QCS, would be a great replacement.  Thought QMM will work, it is a migration tool first and a GAL sync tool second.  If you are going to migrate as well as GAL sync, then consider teh QMM approach that DouglasMurphy mentioned.

QCS will sync GAL, FB and even Calendar Details.  The last part, Calendar Details, is important for Exchange 2007 support as some 2007 lookup scenarios only check the calendar data directly, and not the F/B data.
DouglasMurphyAuthor Commented:
Am looking at Quest as a solution...thanks.
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