I use my Live account to sign into my PC with the same password for PC and mail. I thought that was the whole idea. Once signed into the PC it automatically signs into Live mail. Not only that, but the other MS accounts as well. MSDN, the MS Store, Bing, Cloud, etc. or wherever I navigate to. e.i. when I open IE Metro Bing homepage, I'm automatically signed in, but not so if I open IE desktop. But if I push the signin button, it signs me in automatically. ???
So I think this signs one into the MS account which includes all the others affiliated accounts that one has, as long as using IE Metro. I'm assuming this all has to do with the Metro side of the OS, not the Win32.
Does this make sense to anyone?
Also, I have two Live email accounts and one Gmail account configured. I get notifications on all three. I do have a different password for all three, but use one Live account to sign into my PC.