Hello,

I just migrated an old organization of 300 Users from Exchange 2007 to a DAG of two Exchange 2013 CU8 servers. All went smoothly. Now I upgraded the DAG group to CU9.

I noticed a strange behaviour using OWA. If I configure a user to hide "reading pane", I try to compose a new message selecting "New email" it is presented the new compose window, the address is like: "https://owa.contoso.com/owa/#viewmodel=IMailComposeViewModelFactory&wid=76&ispopout=1"

In this window if I click "To" to select recipient I can browse my contact, instead, if I select Groups I can see all my groups in the left pane but the the list of members (in the right pane) is not presented. In the right pane I can see the name of the group and the loading icon.

If I configure the user to show the reading pane on the right when I click to compose a message the compose form is presented on the right pane of the OWA window and if follow the same procedure described above I can see the group members.

The last thing I noticed: with the hidden reading pane if I copy the link presented in the new window, the one in the format:

"https://owa.contoso.com/owa/#viewmodel=IMailComposeViewModelFactory&wid=76&ispopout=1" in a new tab of the browser or in a new window of the browser the members are showed correctly.

In other words: The problem seems to be related to the window opened automatically by OWA when I click "New Email".

I have another Exchange 2013 DAG running with CU7 installed and I can't replicate the error. Unfortunately is a different installation so I can't say that the problem is related to CU8 and above.

Someone could help me?

Thanks in Advance,
Davide

• Edited by C0ReDuMPX 5 hours 38 minutes ago