Transfer Previous Recipients and Facetime contacts between macs on Mavericks and Yosemite Mail

Recovering a trashed Mail installation from an orphaned drive or just want to transfer Recents without using VCards?

The files you’ll need to copy are:
~/Library/Containers/com.apple.corerecents.recentsd/Data/Library/Recents/
Recents
Recents-shm
Recents-wal

~/Library/Containers/com.apple.corerecents.recentsd/Data/Library/Syncedpreferences/
recentsd-com.apple.mail.recents.plist

Optionally, copy the other “recents” plists as well for facetime, maps, iCal, messages etc:
recentsd-com.apple.calendar.recents.plist
recentsd-com.apple.corerecents.map-locations.plist
recentsd-com.apple.facetime.recents.plist
recentsd-com.apple.messages.recents.plist

…and finally reboot your mac to force the operating system to reload the new plists – instead of using cached copies.