Migration of Exchange 5.5/W2K Server to Exchange 2003/Server 2003

Migration of Exchange 5.5/2000 Server to Exchange 2003/Server 2003
I need to migrate Exchange 5.5 hosted by Windows 2000 Server to Exchange 2003 hosted by Windows Server 2003.

However, I have difficulties even find any manual/documentation to explain how to do this migration: all manuals assume that Exchange 5.5 is hosted by Windows NT Server, not Windows 2000 Server…
Also, my domain is still Windows 2000 domain, so Exchange 5.5 will be migrated to a member server 2003 inside Windows 2000 domain.

Please, help me in pointing me in the right direction for finding documentation for this particular migration.
Also, any comments/suggestions are greatly appreciated in advance.