We've had a problem with some users BlackBerry handhelds. Basically, they're using Vodafone's online mobile redirect and it works fine apart from as soon as an email hits their BlackBerry (5-10 minutes after hitting exchange usually) it is marked as read in their exchange mailbox, whether they've read it or not.
I've been researching this for about 2 months now and all solutions I've found have come to nought. I've tried only downloading the headers, changing where they get the mail from, messing around with the webmail url, changing the time between send/receive on the BlackBerry. I've also spoken to representatives from both Vodafone and BlackBerry support and both were thoroughly unhelpful.
Anyone here able to shed some light on this situation? We're using Exchange 2003 SP2 with varying models of BlackBerry and Outlook 2003/2007. Thanks in advance.