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Exchange 2007 users cannot view Free/Busy info for Exchange 2003 users in same Exchange Organization

I have a single Exchange 2003 server.  I just recently added a new Exchange 2007 server.  I've got just about everything up and running and have migrated a couple test mailboxes from 2003 to 2007.  All users are using Outlook 2007.

The issue:  users that now have mailboxes on the Exchange 2007 server (mailboxes that were migrated from the 2003 server) cannot view the Free/Busy info for any of the users whos mailboxes are still on Exchange 2003.  They can view the Free/Busy info for the other users who have been moved to 2007 server.  Both servers are in the same Exchange Org.  All mailflow is working fine.  The users whos mailboxes are still on the Exchange 2003 server CAN view Free/Busy info for all users on both servers.

If a user with a mailbox on 2007 opens Outlook they can view the calendars of other users on 2003, however if they try to create a new calendar event and use the Scheduling Assistant, the information for the 2003 user will not be displayed, it just says "no free/busy information could be retrieved"

Since we have many users I need this to work so that I can phase the migration from 2003 to 2007.  Please help.

-mcbride
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shockey
Asked:
shockey
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1 Solution
 
kdagliCommented:
First you need to make sure public folder replication between Exchange 2003 and Exchange 2007 is working. Connect to System Folder on Exchange 2003 box, browse through Schedule+Free Busy folder, go to properties, click on "Replication tab" and add the replica server that is Exchange 2007". Once the content is replicated to Exchange 2007 box, your problem should get resolve.
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shockeyAuthor Commented:
already did this step during the migration process.  As I said, the Exchange 2003 mailbox users can see the data for the 2007 mailbox users, but not the other direction.  I need to get this working before I can proceed with the migration.  
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shockeyAuthor Commented:
no one has any ideas on this one...

-mcbride
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shockeyAuthor Commented:
I cant believe I'm not getting any responses on this.  This has to be a common issue.

-mcbride
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shockeyAuthor Commented:
I think I resolved this issue myself after much additional online research.  In IIS Manager on the Ex2007 server I disabled the checkmark to require SSL in the Public virtual directory.  I stumbled across this fix after receiving the error 4003 on the Ex2007 server in Event Viewer each time that I tested viewing the Free/Busy info for an Ex2003 mailbox.

-mcbride
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Pro4iaCommented:
thanks this helped
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