Exchange/Groupwise Global Address Book that spans 4 seperate domains.

We are ankles deep into a 4 entity merger - Priority one is email continuity amongst the various systems.

1 systems run Exchange 2003.
2 System are on Exchange 2010.
1 System is on Groupwise.

Question is:

Is there anyway via MS or 3rd party software in which we can synchronize all 4 address books across the 4 parties involved into one great big global address book for the interim until their is a Domain/AD integration in place.

Currently each domain connects to the mothership via VPN.
15,000 users.
60 locations

Thanks in advance for any input.
HesitdeptAsked:
Who is Participating?
 
Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
Are all these in same AD\Exchange forest or different ones ?
Quest should be able to meet your requirements with Different AD forest so should MIS

- Rancy
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HesitdeptAuthor Commented:
They are not in the same AD\Exchange Forest - They will be eventually - The priority at this time is to keep Email communications up and propagated throughout the system in their current state first and AD integration second so that we can get all the involved parties in under one.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
I would say Quest should help you a lot but its too expensive

- Rancy
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HesitdeptAuthor Commented:
Rancy, I accept your answer, as that is the product I/We were and are still evaluating.

Thanks
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