Big fail

My wlm account neither sends or receives email. It worked before and now it doesn't. It tells me there's a problem with my server address. I have never known what my server address is,but I never needed to because the account worked. I really don't see why I should go through all this convoluted ****. The emails I've needed to send are extremely urgent. If microsoft can't live up to it's name and insists on leaving me in the **** like this I'll use another account as default., After all,what good is an email account that doesn't do its job properly and makes it next to impossible to get help or contact. Big fail!