mattydread23 writes: More than half of big companies are already using Microsoft's management tools to handle PCs. So now, Microsoft is gradually adding mobile management — including of devices running iOS and Android — to the mix. For the time being, they're not going to knock any of the wind out of AirWatch or MobileIron. But Microsoft always starts small, then moves upmarket over time. In five years, the mobile management stalwarts may find their former partner is now a big competitor.