scalix-11.1.0-GA-enterprise-redhat-intel (This is the Scalix server)
Mozilla Thunderbird 2.0.0.12 (This is the POP client)
MickeySoft Office Outlook 2003 (This is the Outlook client)
How does knowing the exact versions help you?
When ANY POP client retrieves mail from Scalix server, Scalix server marks the messages as read for ANY Outlook client. When Outlook is opened, even though no mail has been read, the messages are marked as having been read because the POP client downloaded a copy. This is something Scalix does, not the POP client. Not the Outlook connector. Perhaps there's an om command to tell the Scalix server to stop doing this. Getting mail isn't reading mail, right? Hint: Other server systems don't do this.
As for the other response: Duh!
We tell people not to install software without our review. They install software. We tell them not to open email attachments that morons send them. They open them anyway. We tell them to keep their cakes and crackers and sodas and bottled water away from the computer. They fill keyboards with Starbucks anyway. At least you have a sense of humor about this stuff. I think I'm getting so burned out dealing with 'happy users' that I lost my ability to grin at their thoughtlessness.