MySql 4.23
 

I think MySql 4.0 may not be available on the MySql site anymore. I want to post it for download, but I want to make sure it's not illegal to do this.
Can any one tell me if this is ok?

I think you might be right. I cannot find 4.0.23 anywhere obvious. Since it is open source, and you won't be repackaging or changing the content and calling it yours, I see no reason they would care if you still offer an old version for compatibility sake.

Does their site say anything in a license agreement about they remain the only source for downloads? That also might only pertain to currently supported versions.

http://www.mysql.com/company/legal/website.html

This might be just about the website content, but give it a glance.

[QUOTE]Use of materials on this web site

MySQL hereby authorizes you to view, download, print, copy, distribute, and use the materials published by MySQL on this web site, provided that:

No modifications are made to materials without the prior written permission of MySQL.
Images from this site, including MySQL logos, are not reproduced or posted to your website without the prior written permission of MySQL.
Materials are used solely for only informational, personal or non-commercial use within your organization and are not copied or posted on any network computer or broadcast in any media without the written permission of MySQL
A copyright notice, the following text as an example, appears on all materials: "Copyright

Thanks John, It's posted at my site, in case anyone needs it.