I hope your hotmail account is not the one med school send email too, otherwise you better change it!
hotmail is highly, well, actually morbidly extremely and most of the time unreliable. first of all, if you leave your account 30 days inactive, like most other free web-based email service, will subject for deletion. not just all your emails will be deleted, even your profile will be deleted too. you have to basically resign up the service.
on the email delivery failure side, the problems is rooted into its nature of constantly coping with spam. because almost every one has a hotmail account, every spamer has 20 hotmail accounts, hotmail system is set up that you are not allowed to send a email to multiple addresses. (the limit might be a number greater than 20 less than 30.) further more, sometimes it will block email in which your email address is not on the receiptient (TO
list, because those emails are likely to be spam.
on top of these confirmed problems, irregular delay of delivery or even total failure are usually reported. hotmail also is known for its excessive filtering and frequent "down-time."
my best advice is to use a school account which godforbid will never go down, or an ISP base email account. if it's impossible for you (non-trad), i will recommend you to find a more reliable web base email service.
u can find one from the link below:
http://www.fepg.net/usa.html