Today my emails from one week ago have been arriving again, in chronological order, and showing up as new. Both the emails I sent, and the emails I received for one particular conversation with one particular person.
This happens on the BB, not on my PC's email client.
I have experienced this as it turned out my work email server had a limit of 1,000 emails and when the inbox has more than that it automatically assigns a new number to the excess emails randomly causing them to be delivered to the BB again. You may want to check on the amount of emails in your inbox and reduce some and see if that helps.
