Is there a way to automatically synchronize address books between exchange server?

We will be using Rackspace to host our e-mails. They provide hosted exchange server e-mails for our domain. We would like to be able to synchronize the exchange server address book with other companies that are using exchange server automatically if possible. Is there a way? How about a third party software?

Thanks for the help.Is there a way to automatically synchronize address books between exchange server?The tough issue here is not the synchronization process, it's the rights and security.



The exchange address book is an Active Directory object. Reading and writing it to synchronize it would require significant cross domain rights.



Hosted environments are not amenable to that kind of thing at all. Extending rights to entities beyond thier direct control is unheard of. You can talk to them about it but don't expect a lot of cooperation.