I have set up a Category in Windows Live Mail in order to send to a group of people.  It usually works right away, but after a few days, or even less, when I send again, only a few people on the list receive the e-mail.  The Names in my Category indicate 38, but only 5 or 6 receive it and my e-mail Sent Window indicates that only 5 or 6 being sent to.  When I look at my Contact List and look at the Category, it still shows the 38 names.