The moral of the story: don't leave it so long between your Mac hardware updates.
Mac User Group member is going from a Tiger (10.4.11) Mac to a new MacBook Pro running 10.12.5 & wants to keep acess to his email. Is it still possible to set up POP mail on a new Mac?
I've suggested he clone the old Mac to an external USB drive then use it with Migration Assistant when setting up the new Mac.
Target Disk mode would be more complicated/expensive, involving at least three Thunderbolt & Firewire adaptors.