The MFS Conservative Allocation Fund - Class I (MACIX) is a mutual fund that aims to provide investors with a conservative approach to asset allocation. This fund primarily invests in a mix of fixed income securities and equities, with a focus on lower-risk investments. The Class I shares of this fund are typically offered to institutional investors and have a lower expense ratio compared to other share classes. Overall, the MACIX fund is suitable for investors seeking a more conservative investment strategy with potential for long-term growth.