Looking at the features list for "Google Apps for Business", I see the following:
I am unable to find any information about this feature. What our small business needs is a way to share customer contacts across our Google Apps accounts. We would like contacts added by one employee to be available to everyone. I gather from similar, older questions that people are recommending third-party apps for this purpose. However, I'm curious to know whether this has finally been implemented by Google—without first having to upgrade our account.