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What the article says is true. Microsoft does not support running Exchange 5.5 on a global catalog server because port conflicts occur between the Exchange 5.5 directory service and the Name Service Provider Interface.
However, that does not mean you cannot move forward. What you'll want to do is to bring up a new Windows 2000 DC on a separate machine, promote it to a GC server, and then demote your existing Exchange 5.5/DC/GC to just a DC (e.g., uncheck the GC checkbox and reboot). You will still need to change the LDAP port used by Exchange 5.5 from TCP port 389 to something else (e.g., port 391).
Then, once you have everyone over on Exchange 2000, you can then make the existing DC a GC again.
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