Windows Live Mail marks Junk Mail messages flagged as NOT Junk Mail as READ when they have NOT and have only been marked as Not Junk 

this makes it difficult to see what has NOT been read when you go into your folder

Microsoft need to review their junk mail options, including marking messages/emails as containing viruses - rather than just 'junk mail' or block sender, etc

but the main issue is it marking it as read when you are ONLY marking it as not junk