changing profile icon in Windows Live Mail

I want to change the little profile picture connected to my e-mail address in Windows Live Mail program.  How do I do this?  Actually I DID change it a few days ago, and when I click now on the old, ugly picture that IS there, it shows the picture I changed it to, a few days ago... but in the mail program itself, it still shows the old ugly picture still!!  This makes no sense to me.  So, in my "People" folder, it IS changed.  In my actual Windows Life Email program, it is NOT.