So here’s what you have to do to get MySQL 5.1 working with classic ASP under Windows Server 2003 64bit:

• Install the 64bit version of mySQL Server (Windows x64)
• Install the 64bit version of mySQL Connector 5.1 (Windows x64)
• Now the funky bit. Go download: 64-Bit OLEDB Provider for ODBC (MSDASQL)
• Install the Provider
• Reboot the server
• Set-up your ODBC datasource as per usual
• Modify your ASP connection string to explicitly use the new driver:

e.g.:

PROVIDER=MSDASQL; DRIVER={MySQL ODBC 5.1 Driver}; SERVER=myserver; DATABASE=mydatabase; USER=mydbuser; PASSWORD=mydbpass; OPTION=3;

You should now be good to go. If you googled and saw posts about getting IIS to run in 32bit mode as a solution… don’t. It’s a world of pain, and when we tried it made our server really unstable.