I can't synchronize with time.windows.com anymore either.  I get this error (if you feel so inclined to include it):

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My time and time zone are correct...  it looks like time.windows.com just isn't working anymore (I can sync with the other servers on the list just fine).  Also, I'm in the US, so network latency shoudn't be an issue (plus, this isn't the error you get when that happens).