File it under M for Mysterious, but the president of Microsoft's Windows Phone division has been reassigned by Steve Ballmer for what the company CEO calls 'a time-critical opportunity'.

Andy Lees keeps his title, but is now working on a project which will drive maximum impact in 2012 in terms of Windows Phone and Windows 8.

Convergence

"We have tremendous potential with Windows Phone and Windows 8, and this move sets us up to really deliver against that potential," Ballmer said, in an internal email to staff, although clearly keeping the role exact scope under wraps.

Replacing Lees, for the time being, is Terry Myerson, who previously was the engineering lead for Windows Phone

[source: AllThingsD]