I have loads of address books, all duplicates, which makes managing addresses difficult. I think this is possibly some hangover from a previous version. I don't have the option to delete an address book - maybe it needs to be empty before doing that but as they are all duplicates, if I delete from one, I delete from all. I use an extension, Addressbooks Synchronizer, to save to a network drive which allows me to use them across different devices. Screenshot ( obscured for obvious reasons ) shows my address book pane: there are 68 'Personal Address Book' entries, one 'Address Book' and 3 'Collected Addresses'. I assume it needs to be re-built somehow. Any hints? TIA, Mike Watts