why use MySql instead of Firebird or SQL Server express?

[Steve Richter]

In light of the licensing restrictions on using MySql in a commercial
package, why would MySql be prefered over Firebird or SQL Server 2005
express edition. Both appear to be no charge to redistribute compared to the
$250 for MySql.

http://firebird.sourceforge.net/

http://lab.msdn.microsoft.com/express/sql/default.aspx

thanks,

Steve Richter