The binaries for this distribution of Connector/ODBC can now connect to MySQL server accounts that use the PAM or Windows Native Authentication Plugins for authentication. See The PAM Authentication Plugin, and The Windows Native Authentication Plugin. These capabilities result from linking the Connector/ODBC binaries against the MySQL 5.5.16 libmysqlclient rather than the MySQL 5.1 libmysqlclient used previously. The newer libmysqlclient includes the client-side support needed for the server-side PAM and Windows authentication plugins.

Some catalog functions (such as SQLColumns(), SQLStatistics(), and SQLPrimaryKeys()) would only return one row, when called after pre-execution failed. (Bug #12824839)

An off-by-one error, where sqlwcharchr might read one SQLWCHAR after the end of a string. (Bug #61586)

SQLExecute would return SQL_SUCCESS_WITH_INFO instead of SQL_ERROR, when column parameter binding was enabled. (Bug #59772)

The Connector/ODBC driver did not call mysql_thread_end() when a thread ended, which caused error messages like: Error in my_thread_global_end(): 1 threads didn't exit. (Bug #57727)

MS Access fields with VARCHAR NOT NULL columns could not be altered. (Bug #31067)