XMPP, Browsers (early days and why Internet Explorer is so widely known), Microsoft broke Java compatibility with non windows systems by replacing the native interface with their J/Direct breaking programs for other opwrating systems, MAPI has been accused of doing this to IMAP and POP3 (tho not to the same degree). Its mostly Microsoft, keep in mind even my own mother was born before the personal computer so this has all evolved within the last 50 or so years and completely pertains to software as far as I am aware. Here is a quick wikipedia page if you want to update yourself. There are plenty of battles to fight today, too. Its understandable to not have the will or want to get into it.