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

Not open for further replies.


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.


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.

Ed Crowley MVP " There are seldom good technological solutions to behavioral problems."
Not open for further replies.
Similar threads
Thread starter Title Forum Replies Date
S Outlook mail adressing stops after first match in GAL Using Outlook 0
E GAL Attributes to Contacts Using Outlook 0
E Customer wants a portion of GAL from exchange to sync down to Android contacts via Activesync Using Outlook 2
M Retrieve data from GAL and put it in Clipboard Using Outlook 1
marcadamcarter Interrogate Outlook GAL with PowerShell Using Outlook 0
J Blank GAL in OAB Exchange Server Administration 1
S Searching contacts across GAL and local address book at same time Using Outlook 1
S Newly added user doesn't show up in GAL but available in OWA, Using Outlook 0
S Script to parse email subject, get Username, look up in GAL and redirect email Exchange Server Administration 6
S Pushing GAL to a public folder Exchange Server Administration 2
P Email Header/People pane/contact card - GAL photo vs. contact photo Using Outlook 7
A Managing GAL via OWA Exchange Server Administration 5
X Exchange 2007 Outlook Anywhere Clients unable to retrieve GAL Using Outlook 9
K Problem with GAL in custom PRF Using Outlook 4
J Exchange 2010 GAL Segregation - Is This a Solution? Exchange Server Administration 4
H Correct e-mail address format in address book in GAL Exchange Server Administration 3
B Same Email Address used by Multiple Users - GAL Exchange Server Administration 6
A How to disable bcc option in GAL - Address Book - Exchange 2007 Exchange Server Administration 4
R Outlook 2010 cached mode cannot see GAL but Outlook 2007 can via Exchange 2010 Using Outlook 2
J pemissions to update titles and phone numbers in the GAL for Exchange 2010 Exchange Server Administration 2
A Not able to search by last name in GAL Exchange Server Administration 3
T Dynamic Distribution Groups Do Not Show UP in GAL Exchange Server Administration 18
G Outlook 2003 displaying x400 instead of E-mail address when viewing Exchange 2010 GAL Exchange Server Administration 6
M Exchange 2010 does not updat GAL since few days Exchange Server Administration 28
B Receiving undeliverables for employees that are no longer in the GAL using Outlook 2010 after migrating from Outlook 2003 Using Outlook 3
S GAL - Doesn't Show Groups Exchange Server Administration 3
D Users do not appear in the GAL Exchange Server Administration 4
U Exchange 2010 GAL Order + Alias! Exchange Server Administration 2
O VSTO - Outlook Add-In - Get GAL data Outlook VBA and Custom Forms 1
G GAL program acces in outlook 2007 Outlook VBA and Custom Forms 2
C Problem while converting GAL entries to contacts in Outlook Cont Outlook VBA and Custom Forms 5
Q GAL.ResolveName issue with REDEMPTION Outlook VBA and Custom Forms 5
diver864 vba for a rule to automatically accept meeting requests with 'vacation' in subject, change to all-day event, change to free, don't send reply Outlook VBA and Custom Forms 1
N Free/busy publish at http location does not work Using Outlook 1
V Limiting text length in free text field Outlook VBA and Custom Forms 2
M Outlook 2016 Free/Busy settings ignored Using Outlook 0
O Get Outlook on your phone for free - web page pop up Using Outlook 8
W FYI: CodeTwo Sync for iCloud is FREE now! Using Outlook 0
R Outlook calendar appointments Free/Busy time is changing from "Busy" to "Free" Using Outlook 2
Diane Poremsky Change the All Day Event Default Free/Busy to "Busy" New Articles 3
A export free / busy from exchange Exchange Server Administration 0
V [FREE OUTLOOK ADDONS] Outlook Freeware! Using Outlook 0
M print free/busy schedule of an user Using Outlook 2
S Is Free/Busy supposed to work in Outlook 2013 not connected to Exchange? Using Outlook 14
S edits to free/busy fielddon't show up in meeting requests Using Outlook 2
J Exchange 2010 free/busy shows hashmarks in scheduling tab when not organizer Exchange Server Administration 6
P Appearance (Width) of Calendar Appointment "Show as (Free/Busy/etc)" Indicator Using Outlook 1
T Outlook 2007 forms: Check boxes and free text boxes not retaining data Using Outlook 1
B Outlook 2003: Meeting Organizer will be set as always free or busy status Using Outlook 1
T Outlook 2003 free busy vfb file creation problem Using Outlook 12

Similar threads