Hello- new to this forum, first post. I have a mid 2007 iMac that I recently upgraded to Yosemite (from Snow Leopard). While I like Yosemite just fine, combined with CC it was just too much for this old machine and did some scary things, so I reformatted the HD and reintalled SL and all software, with some help from Apple Tech Support. All is fine except for restoring Address Book (which is called Contacts in Yosemite). All data is on the Time Machine back up. Can anyone advise how I get my contacts/address book back with the various groups? Thank you.