in file Zend_Db_Adapter_Pdo_Mssql in method _dsn() put this changes

            switch (strtolower($dsn['pdoType'])) {
                case 'freetds':
                case 'sybase':
                    $this->_pdoType = 'sybase';
                    break;
                case 'mssql':
                    $this->_pdoType = 'mssql';
                    break;
                case 'sqlsrv':
                    $this->_pdoType = 'sqlsrv';
                    unset($dsn['charset']);
                    break;
                case 'dblib':
                default:
                    $this->_pdoType = 'dblib';
                    break;
            }
            unset($dsn['pdoType']);
        }

        // use all remaining parts in the DSN
        foreach ($dsn as $key => $val) {
            if($key == 'dbname' && $this->_pdoType == 'sqlsrv'){
                $dsn[$key] = "Database=$val";
            } elseif($key == 'host' && $this->_pdoType == 'sqlsrv'){
                $dsn[$key] = "server=$val";
            }else {
                $dsn[$key] = "$key=$val";
            }
        }