All of a sudden my outlook mails have stopped syncing to my Lumia 920 device. I don't know what's the matter cos when I created a duplicate account for the same email id, that is syncing properly.

I read a few discussions here where you guys(Microsoft) did something at the back end to resolve this issue. So please help me out by doing the same.

P.s- I can't hard reset my phone, too much important data on it and from what I read it hasn't really helped.