imap update issues

I am using my BlackBerry (8310) with BIS and my personal exchange account through imap. This way it puts my sent mail in the sent box on my exchange account.

The problem is when I reply to, delete, set a reminder etc against an email in Outlook the message reappears in the inbox of my BlackBerry as though it is a new message.

How do I turn this off as it is very annoying and I have double responded to people.

Thanks in advance for any help

Mike

Weird. Has it always done this? I'd say try removing and readding said account...

It hasn't always done this. I had to get a new device as the old one stopped working after a month. Do you think eadding will fix?

Mike