Don't do it! We crashed our Mypoints accounts, when my wife and I combined our HH accounts (the "mutual" thing"). The day we requested the next transfer, the accounts were frozen. In typical Mypoints customer service ( ) , we were never told why. However, I am pretty certain that it was the linking of two Mypoints accounts to one HH account. (BTW, this makes sense. Otherwise we could open hundreds of free email addresses and funnel thousands of points to a single HH account.)