Wirelessly posted (BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
"The letter also mention if the card is closed, the standing balance on the account will be forfeited."
It's the miles attributable to the standing balance (if any)on your credit-card account that will be forfeited. Miles that have already posted to your Dividend Miles account are safe.