Outlook.com app won’t sync on Android phone

I'm using the outlook.com app on my HTC oneX and have been for a while now, but for some reason recently everything stopped syncing to the phone. I hadn't changed any settings on my end, but I tried removing my account and recreating it. Since then only my Inbox shows up, with no messages, even though it says it last synced only a couple of hours ago. I can't add my other folders to be synced either. I've read a few similar threads on here, except now I can't view any emails at all. Any ideas?

Thanks

Courtenay