You and me, friend. Whatever happened to the MS division that published those games?
Unfortunately, they're driving the franchise into the ground with bugs and no support. :( If anyone at Microsoft reads this... help us!
Some guys from Ensemble has since formed Robot Entertainment, released e.g. AoE Online, and is supposedly (?) using Microsoft as publisher once again but I don't think they're part of Microsoft Studios anymore. AoE Online was shut down in 2014 though. :/
Also there is huge challenge to create playable RTS game with current popular monetization strategies - in game purchases