For many tech-savvy web users, Microsoft’s Hotmail has become a badge of ancient times, a service that was valid a few years ago but that has gone the way of AOL as a symbol of not being “up with the times” in email technology. People who see their friends using it might ask, “Why aren’t you using Gmail?” Tech-snobs aside, the service is still extremely popular and their most recent innovation may give even the tech-savvy crowd a reason to check out their old Hotmail inboxes if only to use it for the gray-area emails. When they declared war on “Graymail” a month ago, they introduced a set of tools that will…