Google? Gone. Linux? Destroyed. Mac desktop platform? Gone. Windows mobile? Total monopoly. MSIE? Dominates the world. Java? Completely unknown compared to Microsoft .net offering.
Oh wait, that's not what happened. Maybe some selection bias is going on?
Intuit was one of the few that survived direct Microsoft competition from MS Money and MS TaxSaver.
Adobe and Autodesk survived because Microsoft never entered the professional graphics editing market of Photoshop and CAD drafting. If Microsoft did try to compete, they still might have lost to Adobe and Autodesk but it sure helps when Microsoft ignores that market. (Microsoft sort of had a competing edocument standard of XPS to Adobe's PDF but that initiative didn't seem to have all of MS's attention behind it.)
Computer Associates (now CA Technologies) was this weird corporation that basically did a bunch of acquisitions of forgettable companies. I can't think of an instance where CA and Microsoft competed head-to-head. CA bought a database programming 4GL (Nantucket Clipper) in 1992 but the DOS based programming languages were already starting to die by then so MS Visual Basic for Windows didn't really compete fiercely with it.
Most of 1980s companies didn't survive, whether they competed with Microsoft or not. Microsoft did, but that doesn't mean it killed every other company that didn't.
But Microsoft competed with Apple, and Apple didn't die. Xenix - Microsoft's UNIX offering - went nowhere (though it wasn't even MS product, technically), and other Unixes still alive. In DOS times, there were pretty successful competitors to MS-DOS (of course, those died when DOS computing died, but I'm not sure this qualifies as direct competition).
For a brief period. So did many other short-term phenomena, from BASIC to MS Access to Clipper to Pacman. And now they are stuff for the museums. Except for Pacman, of course.
> Never made much of an impact on the desktop
So? It still survived competition with Microsoft - and, arguably, won on every platform except Windows, non-Windows .net use is still basically zero and Linux rules server world, so...
> What's the most widely used Java desktop app?
I honestly have no idea. Well, Eclipse of course, IntelliJ suite of tools, probably, but it could be some other apps are Java too and I just don't know it. The point is Java is alive and well despite competition from mighty invincible Microsoft.
Eclipse is way more than just Java IDE. In fact, I've been using Eclipse for many years for a number of purposes, and 80% of that time - not as Java IDE.
Oh wait, that's not what happened. Maybe some selection bias is going on?