How to sync your mac osx addressbook / contacts to gmail contacts.
for addressbook contacts on osx lion and later:
- open addressbook (which is now called ‘contacts’)
- goto preferences > accounts
- tick the ‘synchronize with google’ checkbox
- enter your google account information

for addressbook on snow leopard and earlier:
basically there are 3 steps.
- enable google
and yahoo in the addressbook preferences
you need to enable yahoo so that it will sync properly.
- enable isync in the top bar thingy
- sync
ok, so on to step one.
- open addressbook. goto preferences > general.

tick the box for enable yahoo sync.
fill in your details
- tick the box for enable google sync.
- fill in your details.
if you dont have the option to enable google sync then you need to plug in an ipod touch or an iphone, or search google for a way to enable it without one.
you need to enable yahoo syncing so that the next step works.
now on to step two.
- open up isync (applications > isync)
- goto preferences
- tick enable syncing on this computer
- tick ‘show status in menu bar’
now onto step 3.
- hit the big sync devices button in isync or goto the menu bar and click the sync icon
- sync now.
- done.
you will now have all your gmail contacts in addressbook and will most likely need to sort them all and merge a few. good luck.