In my opinion this is a question of time and priority, anyway below there is a relevant pool about this subject.
Forum on trading, automated trading systems and testing trading strategies
What Platform Does Your Smartphone or Tablet PC Use?
MetaQuotes, 2012.05.16 13:20
Yes i saw this one time. But its not specially for windows phone. What i mean is that you cant download it on Windows Store like on Google Play. I tried to download this windows phone file, but the truth is that it doesnt work on the newest models. So it is not possible to use it. Would be very nice if it will be available on windows store soon.
Some quotes of Renat (Metaquotes CEO) (not recent, so that can be changed).
In the development of commercial products should be guided in the near future within 3-5 years.
The winners in mobile have clearly defined - is the iPhone and Android
(if it is not manufacturers would kill glands). Windows Mobile is not
just an outsider, but the absolute corpse. In Windows Phone fate
uncertain (probably not the tenant).
Although, of course, do the terminal under Windows Phone will have as soon as they open the Native API.