- Is the server in a domain in which DomainPrep has been run? Note that the server does not have to be in the same domain as the Exchange server.
- Is the server in the same active directory site as the Exchange server?
Once this has been accomplished, DSAccess confirms the following:
- Is the server listening on port 3268?
- Can the server's security descriptor be read in the Configuration Naming Context of Active Directory?
- Is the server in synch with the rest of the domain?
- What is the weighting of the server's associated Service (SRV) Resource Record in DNS? High weightings will be given higher priority for client requests than lower weightings.
DSAccess then maintains a list of up to 10 global catalog servers that meet all these criteria. Finally, DSAccess ranks these servers by assessing two further factors--response time and number of outstanding requests. This permits efficient load distribution across these global catalog servers.
So in summary, Exchange won't prefer either Windows 2000 or Windows 2003 global catalog servers -- rather than version of Active Directory, Exchange uses other criteria to make this decision.
This was first published in October 2004