Today suddenly my address book isn't working properly anymore. I can't add new cards. When I want, address book hangs. Couldn't find a solution yet. What I tried: imported backup (abbu) and older backups. Didn't work deleted the abcddb file (Library/Application Support/Adress book). Didn't work Did a reinstall of the addressbook from the Lion "disk". Didn't work Repaired Disk Permissions. Didn't work I can, however add info to existing cards. Suggestions anyone? ++EDIT and solved++ For those: First make a backup of the address book! I deleted the address book with app zapper. So also the map Library/Application Support/Adress book was deleted. Check if that happened. If not, do it manually. The address book app has been deleted. Restart Open the Lion dmg and find the package address book. Install it (double click). Restart Double click the backup abbu file (you made earlier) in Finder. Do NOT import this backup through address book "import" option! Once this backup has been put back in address book you can open address book as normal. Don't have a clue why I got these problems, but this procedure worked for me.