There is a large contingent of heavy Windows users who move their sidebars to the left or right who MS may also be content ignoring, because many of these users

There is a large contingent of heavy Windows users who move their sidebars to the left or right who MS may also be content ignoring, because many of these users have no alternative. They may, for example, be heavy Excel users, with macros, etc. In why case now other OS is even an option.