That's because you still use an email program developed in the 1980s...try importing your account to live.com or some other webmail site.
(That's what you call Outlook webmail)
I don't recommend Yahoo for anything but a spam bucket and safety net when you register for sites and certainly not any Lycos sites.
I'm not being a smartaleck, my ISP gave me an ultimatum 5 years ago and I moved to Hotmail, which was ended and became Windows Live Mail along the way (live.com). I looked at Mozilla-based browsers once and wasn't thrilled with how AOHell had neutered Netscape and so that is the route I took with IE back then.
Web, WHY haven't you gotten Lee into at least Windows 7 yet? IE 11 has it's phun moments but it's probably like Vista, only working and by god I like 7.