If you also have a Centurion or Platinum card you will receive a postal letter from American Express mentioning that the Blue Business Plus card has been linked to the "more rewarding" Membership Rewards First program. There used to be some worthwhile differences between standard Membership Rewards and First, but most were removed, and I'm not aware of anything now that warrants attention.
Last edited by mia; Jun 2, 2017 at 12:12 pm