A user is receiving meeting invitations and wants them displayed in his inbox if they are not processed so the calendar preferences are setup accordingly and this has been checked several times.
When this user receives an invitation, it is staying in his inbox for 30 minutes, one hour sometimes and without anybody touching it, it is disappearing from Inbox , showing up only in All Calendar Entries as unprocessed.
Five persons have access to his mail file and as we are aware, nobody is touching the invitations except one of them who didn't touch the test invitations at all.
Exported the invitation as text when it was in inbox and after it disappeared and there are no differences in the structure .
The user has a local replica and two replicas on the servers, primary and backup.
Please give me an advice .. I have no starting point for this. Thanks !