The platforms look nearly identical!
MT5 was designed to be able to trade markets other than Forex, such as stocks and commodities, essentially because it is better able to plug into a centralized trading exchange. Other advantages:
MT5 permits both hedging and netting;
MT5 is faster and more efficient than MT4
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MetaQuotes confirmed that the company will stop issuing new licenses to new brokerages, although the MT4 platform can continue to be used by existing customers.