GAL and Free/busy Sharing between Exchange 2010 and Exchange 2007

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bigmikevt

There are two separate entities within our organization that wish to share GAL and Free/Busy information. They each have their own Forest and Exchange organizations and plan to stay separate. Forest A is Windows 2008 AD and currently updating to Exchange 2010 from Exchange 2007. Forest B is Windows 2008 AD and Exchange 2007 SP2. At this time there in sufficient resources (time and manpower) to update Forest B"s entire Exchange organization to Exchange 2010. Additionally, there is no possibility to use Federation or Forest-Trust between the two forests. I understand it is possible to establish the sharing of GAL and Free/Busy between two Exchange 2007 organizations without establishing these trust relationships.

My questions are as follows.

1. Can Forest B remain at Exchange 2007 SP2 and establish the required connections to Forest A"s Exchange 2010 organization?

2. If this is not possible, can Forest B be prepped for Exchange 2010 and install a single 2010 CAS server for the purposes of synchronizing with the CAS servers in Forest A"s Exchange 2010 organization? The Forest B Exchange organization would remain in mixed-mode for at least 6 months.

Thank you for your assistance.

-Mike
 
E

Ed Crowley [MVP]

1. No. You need at least one Exchange 2010 CAS server in each organization.

2. Yes. In addition, you will need to establish GAL synchronization if you're using Outlook 2007 or earler because users must pick others from the address book, not by typing in SMTP addresses.

http://technet.microsoft.com/en-us/library/dd638083.aspx

Ed Crowley MVP " There are seldom good technological solutions to behavioral problems."
 
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