I've had a hunt for this but can't really find a definitive answer. I recently did a hard reset on my 620 running 8.1, and for some reason it hasn't pulled down my contacts from outlook.com when it has done in the past. Calendar and emails are fine - it just refused to pull down my contacts, so I was missing quite a few numbers (mostly from my non-Facebook people, and people whom I have the number of, but isn't readily available on Facebook).
Could it be a region thing? I set it to US (instead of UK) during setup for more Cortana playing - only way I could get the new updates (such as the quiz and the separators). I use a live.co.uk address as my Microsoft account.
Could it be a region thing? I set it to US (instead of UK) during setup for more Cortana playing - only way I could get the new updates (such as the quiz and the separators). I use a live.co.uk address as my Microsoft account.