It is pretty.
Myriad light semi-extended?
Kyrial sans light?
It's got that humanist/Frutiger vibe, but rounder, more extended, taller x-height...

As previously suggested by monmeehan and probably too much obvious, I would have said Myriad (Semi Extended Light). I assume the official former logo was set in Myriad. Makes me also thinking to Segoe (could be the one if these captures come are related with Windows Mobile). Another similar is Interval Sans.

Is it some form of Segoe? Are those screenshots of Windows Mobile UI?