Windows Mobile has not had the ability to handle OOXML-based documents until now.
This might make 2 applications which are built from the same codebase and properly support a derivate of OOXML. Both applications come from the same company, to whom OOXML is "a simple matter of (its) commercial interests", according to its own manager.
With over 6 million pounds in debt (nearly 10 million US dollars) we guess it's likely some other company will take over the site (if it deems it worthwhile)