Why did they actually discontinue IE for the Mac (years ago) or did they never release IE for Linux. One of the reasons IE is losing market share (relatively) must be that people who are coming from other platforms, tend to stick with the browser they like.
IE 4 was great at the time (and won the browser war with Netscape).
I do not understand why they (MS) seem so fearful of embracing the open standards/multiple platform approach.
It's never too late if you have a mammoth no users already in one or other form (OS, Windows phone et al.). If MS still opens up the browser and start giving some goodie bags to the developers, something similar to other app stores, we might see some share of the pie going to MS.
They're already fighting an uphill battle against Linux in the server market. They're probably concerned about what lending credibility to it on the desktop could do.