Free/Busy not working Exchange 2007 and 2013 co-existence

Hi,
I'm migrating our Exchange 2007 environment to Exchange 2013. Now I am in a co-existence environment where all the mailboxes except some test-users resides on Exchange 2007. Between Users on the same Exchange MBX Server athe FREE/BUSY Information sharing
works correctly, but between Exchange 2007 and 2013 it's not working.
I verified my settings and also the EWS virtual directory on 2007 CAS Servers using Get-WebServicesVirtualDirectory.
The internal and the external URLs are set to https://legacy.mydomain.com/....
What am I missing?
Thanks & Kind Regards,
Jürgen

Hi,
According to your description, I understand that the free/busy information between Exchange 2007 and Exchange 2013 is not available for your coexistence environment. To narrow down the issue, please check the following points:
1. Does the issue happen to all users or specific users?
2. Although a user on Exchange 2013 can't get free/busy information from a user on Exchange 2007, please confirm whether Exchange 2007 user can get free/busy information from Exchange 2013 users.
3. Close Outlook and only access user mailbox from OWA to check whether the issue persists. For Outlook client,
create a new Outlook profile
to have a try.
4. Please make sure the virtual directories settings are configured correctly in both Exchange 2013 and Exchange 2007.
Virtual directories settings in Exchange 2007:
http://blogs.technet.com/b/meamcs/archive/2013/07/25/part-3-step-by-step-exchange-2007-to-2013-migration.aspx
Certificate and Virtual directories settings in Exchange 2013:
http://blogs.technet.com/b/meamcs/archive/2013/07/25/part-2-step-by-step-exchange-2007-to-2013-migration.aspx
5. Restart IIS service in Exchange server by running iisreset /noforce from a command prompt window.
If possible, please run Test E-mail AutoConfiguration in Outlook to check whether the autodiscover service can get correct Availability service URL in the results. If there is any event logs, please collect some for further analysis.
Regards,
Winnie Liang
TechNet Community Support

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  • Help - Edit cell of a multicolumn listbox at run time

    Hi All, I am populating rows and columns of a multicolumn listbox from a file at run time. However, after the data is loaded in the listbox I want to have the option of changing cell value. Can I do that? If so, how? I appreciate your time and help.