One hour ago I signed in to MS account, after two or three "try again later" messages. Now, the next challange: the c101a006 error. I cannot update or install any app. The Store remain closed, in fact. What a mess!
I also tried again to sign in with my MS accoutn and it worked, at the rfirst glance I was relieved, but then when I wanted to update the apps....same error.
I hope it's just a temporary problem and it will be fixed until 15 december.