For those of you confused about the nomenclature of the 21xxx and 23xxx, they are
not numbered in order, eg 23123, 23124, 23125, etc. The build numbers are branches and the mumbering sequnece is kind of wonky but it is not numerical.
As for the differences between 21xxx and 23xxx...as it has been pointed out many times, the
21xxx builds are based on WM 6.5 and have the start button in the upper left and are
LESS finger friendly and (for the most part)
MORE stable.
23xxx builds are based on WM 6.5.x and are mostly beta builds, are
MORE finger friendly and (somewhat)
LESS stable (YMMV). With the 23xxx builds, the start button is in the bottom left part of your screen.
David