We have Exchange and Outlook 2013 with a cluster of 2 servers connected via VPN. Clients are connected to servers via LAN DNS.
Most emails arriving in an inbox are quickly converted to a draft message, showing the "From" as the actual sender.
There is not much on this error, but from what I gather, it's likely the message is being modified somewhere because at the top of the email it says "This is the most recent version, but you made changes to another copy. Click here to see the other versions." when in fact there have been no changes, or has the email even been opened.
I checked the mailbox rules, nothing there.
I checked the delegation and permissions, nobody has permissions except the Exchange Server and the Exchange Trusted Subsystem. No other issues are reported by other users.
This problem is frequent, but intermittent. Doesn't seem to be happening when Outlook is closed.
I removed and added a new Outlook profile, problem still exists.
Any ideas?