We are trying to sync our iPhones in the office to one central contact list and cannot seem to get it working properly. Here's the scenario: We are using Exchange 2003 and we have 2 exchange accounts set up on each of the 3 different iPhone 4's. One account is the person's individual account (like firstname.lastname@example.org) the other is a master database account (email@example.com). We have mail, contacts, calendars setup on the firstname.lastname@example.org but only contacts are on for the email@example.com. We have 13,000 contacts in the contacts folder for firstname.lastname@example.org. The problem: Every iPhone loads all the 13k contacts then after about 30min the iPhone kicks all the contacts off then reloads all 13k contacts again. This happens in a constant loop all day. Has anyone heard of this? Or heard of a solution? We are just trying to find a way to get one contact list synced to multiple iPhones.