It uses Metaquote data. They also disabled option to use external data (no more Alpari).

Their historic data differ from Alpari's grrr and beta testing results are different. (add another grrrr) lol

More about this subject you can find here: Tester in MT4 Build 200

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Vince, I was thinking the same way. Since most of backtesters will use Alpari historic data I've already decided, when I will open live account, I will open with Alpari for start.

Now, there is the way, to use 99% modeling quality for backtesting. Msg nr 4:

"Phoenix - FAQ, Stable, User support -Read Post #1"

I've lost the link where I downloaded it from (still searching lol), but I have data for one pair for 99% modeling quality. I couldn't use it, but it was probably because of MT b200. Will try to reload it today with MT b198. I hope it works. Would really be great, if we can all set up our computers to 99% modeling quality and at least eliminate one worry/issue - data for backtesting. There are already enough issues to worry about IMHO lol

Mario