A user’s Blackberry has been receiving old emails (1 year old roughly) lately. According to the all-knowing Internet, it might be related to having too many messages in your Outlook Inbox. When the BB goes to reconcile, it has trouble dealing with all those messages. I dunno, sounds sketchy, but I checked the user’s Outlook and he had over 15k messages in it so maybe there’s some truth to it. I moved all but the last 2 months to his Archive folder and we’ll see if the issue happens again.
Ref: http://forums.crackberry.com/f52/receiving-old-emails-again-25862/