NOTE: The following are suggestions based on what has been done with some customers. Most information is part of our Documentation already available (User Guides, Installation Guides, etc).
Things to consider:
Legacy SMP agents (6.x/7.0) can still function as per normal with the 7.1 SMP Server but they will need to be redirected to the new server. The Agent Update policy will then need to be enabled to upgrade these to 7.1. Alternatively, once the data from the old server has been imported into the 7.1 SMP Server, users can perform a Discovery and re-push the new agent out to all machines again.