I have an Exchange 2013 server (Version 15.0 Build 1365.1) with a mixture of Office Professional Pro Plus 2010 and 2016 32-bit clients (updating all to 2016 later this year) running Windows 7 Professional or Ultimate. I am running ESET Endpoint Security 6.6.2064 and 6.6.2072.4 and am currently in the process of updating all to 2072. I am using the email client integration with ESET and Microsoft Outlook.
I noticed in some client's Outlook that every message delivered to shared mailboxes t
Sync issues occur if a particular email is modified concurrently, e.g. when scanned both on the server and client at the same time or when downloaded on more devices. If email is scanned on the email server, you can disable integration with Outlook. We've been working on a plug-in overhaul last months which will prevent sync issues and it will be included in Endpoint 7.0.X.