Just because you have a large installed base for a product, doesn’t mean
it’s an attractive market for add-on products.
Consider when Microsoft finally abandoned Windows 98, there were said to be
something like 40 million people still using that product. But they were
quite happy not spending any more money on their systems, so in economic
terms, they had become invisible.
Windows XP still accounts for the vast majority of the Windows installed
base. But it looks like it, too, is already becoming invisible: Microsoft is
not going to provide a version of Internet Explorer 9 for XP
<http://www.zdnet.com/blog/networking/there-will-never-be-an-ie-9-for-xp/170>.
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