How's this for irony... this seems to have happened on the same morning that our local Exchange 2013 box has decided to die thanks to an Active Directory problem capable of causing Win2012 server to bluescreen..
A small part of me is vaguely reassured that MS's own platforms, running under their own control, are just as fragile as on-premise installations... that said, it would be rather nice if things just worked (and continued to do so) sometimes!