Iphone mail app for hotmail not working

Hi,

i have the iphone 4s and have been using the mail app to connect with my hotmail account. in the past it has never been a problem but over the last few days it has not been recognising my password or verifying the account. i have deleted the account and re-installed it...did not work, i have logged onto the account using a p c and it seems to be fine, i am able to log into my gmail account but hotmail it has a problem with. any help on this issue would be greatly appreciated.