IE 10 doesn't support Flash. You will need to install a separate browser and Flash for those video's to work. I think iOS and Android are also off now for Flash, aren't they all moving to HTML 5?
Yes, the horizontal scroll list for Favorites can get long, but just start typing and those icons will appear above the address bar.
I have several accounts in my Mail app, Yahoo, Aol, Gmail etc. Have you added accounts?