A user has a set filter, not to show already read mails in outlook. The filter is mandatory for the user. The user also can access the mailbox using his blackberry (the BES is at the mercy of the mobile provider, and it connects to my Exchange using sPOP3)
When the BB phone connects, the emails are automatically marked as "read" which of course means the user will never see them in the Outlook inbox.
The question is how I can prevent this marking as read, so no email is missed in Outlook, without access to the BES (and the provider refuses to make any changes there). A way to mark anything pulled out via POP as unread will also work for me of course. I couldn't find a setting in the BB phone itself to prevent marking everything as read.
Versions: Outlook 2007 / Exchange 2010
UPD: after opening up IMAP the issue is resolved. Thanks to everyone who responded
POP3 is your issue - I'm afraid you can't do much without changes to the access method.
Is it a carrier-managed BES, though? That would seem to me as a bit odd, since BIS is built around just that scenario.
The mobile providers that I've dealt with have always used BIS - which the user should be able to configure to use IMAP or HTTPS API calls, avoiding the POP3 read marking behavior - as well as letting you turn off that antiquated protocol.
If you absolutely can't get away from POP3 you can use this ugly hack:
Make a second mailbox for the user, configure it as an alternate delivery recipient for the user, hide it from the Exchange address list, and use this "clone" mailbox as the POP3 mailbox for the provider to poll.
It's ugly, but it'll do what you need. You'll want to clean out that "clone" mailbox periodically, too.