If I understand this correctly, when an email comes into outlook, it is bold (unread), then a few minutes later it's not bold (read).
I believe this is a normal function of BIS email and the email program. Email comes into outlook, then shortly it is 'pushed' to your BB. This pushing is what is changing the unread to read in outlook.
I welcome input from our other addicts. But this is exactly how my email programs behave with my BB setup for receiving email.