I regularly send emails to a Contact Category.  Since a significant update two months ago, Windows Live Mail does not recognize the category name as an email address.  I notice that the category appears in the addressee box with a "+" before it.  But when I attempt to send, I get the message that I need a valid email address!  If I ADD another address t the SEND box, it appears that the message is sent (i.e., without further protest that Live Mail can't send to some particular bad address).  But when I look in the SENTMAIL category, themessage was NOT sent to all the contacts in the category.

In Outlook, a category of contacts was usable as a kind of listserve or lump mailto.  I need to be able to send the same email to 82 different people at a time.  HOW???