I have a similar problem with my WLM account.  I've been using it on my laptop for two years or more and then suddenly this morning I'm getting a similar error message to Nishad apart from the Port which is 110 and the (SSL) No. I'm still getting my emails coming through on my Tablet and can pick up my account on the web, so it appears that it has nothing to do with my account provider (not Yahoo by the way). I've also spoken to my provider and there is nothing wrong there.  They say it's a Windows issue. Help please chunterbox