I have two questions: 1-Why Historical data providers charge higher price for 1 minute intraday compare to 5 minute intraday? we all know that 1minute bar can be converted to 5 minute bar and higher , So what is wrong with breaking 5 min bar down to 1 minute bars? Will these cause any inaccuracy when testing? 2-Which Data feed has longest historical data that can be downloaded into products like Qcollector from mechtrading.com (www.quotelink.net collects realtime data, not historical). Problem is Esignal provide 120 days intraday history http://www.esignal.com/esignal/features/featureslist/data.asp while what tradestation offers is beyond compare to Esignal. http://www.tradestation.com/strategy_testing/hist_market_data.shtm So is there a way that you can automate hundreds of symbols at a time with Historic intraday data to be loaded into excell program after market closed each night? 3-HistoryCentre 3.0 for TradeStation/ProSuite 2000i http://www.pcharts.com/hist/hc/ Does anyone using this product, how long will it take for each symbol historic intraday data get loaded directly into TS2000i (i mean without having to convert to XPO then import into global server)? And how does TS2000i can integrate with any ASCII data for direct import, because above site seems hasn't mentioned anything on this?