Hotmail not so hot!

Must be getting near 40. Feel like a grumpy old man today - must be something to do with the very wet weather today and the fact i picked up a cold the past 2 days. Yup - dodgy food to cold in one easy step! Any how i digress. I use hotmail, but over the past two days been getting poor service - can log into mail and read it, but as soon as i want to send a reply i get "Windows Live Hotmail couldn't send your message because the server was busy. Please try again later." How busy does it need to get to this stage? How difficult is it to send email from online mail? When things work there great and you take them for granted but when they fail, its irritating. oh hum!