After you have upgraded your perimeter network and your Director (if you use one), deploy Office Communications Server 2007 in your internal environment by completing the following steps:

1. Deploy an Office Communications Server 2007 Standard Edition server or Enterprise Pool. This pool or server uses the Office Communications Server 2007 Edge Server for remote user access and for external access to meetings.
   
2. If archiving is required for your new server or pool, install and configure the new Office Communications Server 2007 Archiving and CDR (Call Detail Recording) Service. Your existing Live Communications Server 2005 with SP1 Archiving Service does not work with your new server or pool. When you are finished upgrading your internal servers, your new topology should resemble that shown in Figure 3.
   
   Figure 3   Mixed Topology with Office Communications Server 2007 Internal Servers
   
3. Verify that User Replication completed successfully on the new server or pool.
   
4. Back up user data on the existing Live Communications Server 2005 with SP1.
   
5. Export user data from Live Communications Server 2005 with SP1.
   
6. Move users to Office Communications Server 2007. You might want to transfer a small number of users at first to test the configuration.
   
7. Configure users on Office Communications Server 2007.
   
8. Transfer remote call control settings as necessary.
   
9. Validate the configuration and connectivity of the server or pool.
   

At this point, the users who were moved to Office Communications Server 2007 are still using Office Communicator 2005 as their client. They are able to use the following features as if they are still using Live Communications Server SP1:

• Internal IM and presence
  
• Remote user access
  
• Federation
  
• Public IM connectivity