Access SQL Server 2005 EXPRESS From SQL Server 2000?

I have just acquired my first root server (Microsoft Windows Server 2003) to run a lightly used ASP application. I installed SQL Server Express 2005 on the server and the application works just fine. The problem is that I cannot access the SQL database on the server from my local computer that is running SQL Server 2000 Developer.

Please note the following:
1) I can access the server database (2005 Express) from a computer that is running SQL 2005 developer.
2) I can access other servers that are running non-EXPRESS versions of SQL 2005 from my computer (which is running SQL 2000)

Thus my question is:
Is there some kind of limitation or required setting in SQL Server Express to allow remote connections from SQL 2000?

Remember - I CAN access the database remotely using SQL 2005, just not SQL 2000.

I am using SQL Query Analyzer to try to access the database from my local computer using the same connection parameters that work on my SQL 2005 computer in Management Studio.

Thanks for any help!