You're not alone. It's down for me again too, for most of the morning as far as I can tell. It's becoming quite common these days. I set one up for my wife to use for personal emails and she's grown quite frustrated with it of late. I may eventually switch her over to Yahoo (at least until this gets out of beta) since she's also increasingly using their Launch radio.
It's a free email service so I can't really complain. I primarily use mine for online registrations and personal emails that I don't want on my email server at work. But the speed has been sporadic and the uptime quite buggy over the last few months. Fortunately, the particular email I was hoping to retrieve this morning was also Cc'd to my Yahoo address.