I'm using Windows Live Mail 2012, recently I keep getting the 'bing' sound and the icon notification for a new email, but no email actually arrives.

Nothing in inbox, nothing in junk, no email anywhere. I don't know if it's just a random notification or if emails are actually getting lost somewhere. It has been happening at least once a day for the last week or so (happened three times in the course of typing this).

I've sent myself a couple of test emails and had a friend do the same, they all came through. I have both a hotmail account and my isp email account, the emails sent to the hotmail address seemed to be slower than usual.

At the moment I have two unread emails sitting in my inbox but Mail says I have four unread.

Anyone know what's going on?