BlackBerry Smart Phones

I have a paid Hotmail account and before I ugraded to this new Curve, my emails would reconcile just fine.  Now, when I delete an email or read an email from the internet, it does not delete or show it as read on my blackberry.  So, my BB is now full of 'new' emails that should be long gone or at least displayed as read.  I receive emails just fine, that part of the reconciliation works, but for some reason once they end up on my blackberry, they no longer reconcile and are just left on there until I manually delete them from my phone.  This is very annoying and because it used to work on my old blackberry, I dont understand why it stopped working on this Curve. Does anyone know why it is doing this?