Since you will be returning your old unit directly to TomTom under RMA, I think you'll find them to be very cooperative about a transfer of any subscriptions you have purchased from the old unit S/N to the new unit S/N. You'll need to synchronize that effort with Tech Support when you get your new unit. Since they have to swap the subscription over to the new serial number, they might as well manage that change of your old email address as well. It's either that, or you'll have to couple a new email address to everything. When moving a subscription, it's usually easier for them to take your existing account and swap unit serial numbers there rather than start from scratch with a new account.
