In Dynamics AX2009, the Global Address Book is a repository for every Person OR Organization that your organization comes into contact with.
When you create a customer, vendor, employee, business relation, contact or competitor, a record is automatically created in the global address book.
However, only certain common fields are shared:
• Communicaitions (Telephone, fax, etc)
• Number of employees
• Organization number
Other data will not be synchronized.