Re: OS integrated browser was MS's point of failure.
"But IE offered "multiple tab browsing" by putting each new tab (each new window) into the taskbar at the bottom of the screen -- a break with standard (and very successfull) Windows design of putting application menus on the application window, not on the main screen."
IE conformed to the Windows 95 "document-centric" ethos - each separate document was supposed to have its own window and button on the taskbar; it was Firefox that broke the rules. Tabbed IE now has the horrific mess of a single window and multiple taskbar entries, similar to Excel and its dreadful MDI window left over from Windows 3.1 days.