1. For readers clarification this would be Unity Connection 8.5 not Unity (windows based appliance)
2.You have Unified Messaging aka SIB (Single Inbox)
3.Issue is that after deleting the message in Outlook it appears back in the Inbox as unread.
This behaviour seems to point to synch issue, where Exchange is not pushing the notification to CUC therefore the message is never deleted from the Connection perspective, and after a while CUC pushes the message back to Outlook.
If the issue can be reproduced, a test to isolate the issue on the Outlook client would be to close it (outlook client on the users workstation) , leave a test message to the user and then deleted via OWA, wait for a while to see if it reappears.
Would you happen to be using the CUC SMTP domain the same as your corporate domain? If so please change it (if its running on vmware you will have to rehost licenses). Additional info here:
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