MS has received and paid about €561m monopoly infringement fines from EU Commission for "forgetting" again to provide the choice of browser in the first 14 months of Windows 7 [1], totalizing €2bn fines from EU. Times seem to have changed though, as no-one seems to be pursuing MS for Windows 10.
Microsoft doesn't have the monopoly it once did with the proliferation of tablets and such. Anti-competitive behavior is fine as long as it isn't monopolistic. Every browser on iOS is a UI on top of the mobile Safari engine - the equivalent of Windows only allowing IE and browser skins - but that type of anti-competitive behavior is OK because Apple only controls 30% of the mobile devices and its users choose to buy into said anti-competitive environments.
[1] Last lines of https://en.m.wikipedia.org/wiki/Microsoft_Corp_v_Commission