I believe not supported means that those Windows versions (which are no longer adequately supported by Microsoft) aren't tested during development of Intel software tools.
Among the issues is that Intel discontinues testing of hardware platforms which are no longer in production, but the older OS versions may not be suitable for current production hardware.
If Vista were to be supported fully on current ifort releases, it would require testing VS Shell and together with VS2012 C++. I suppose you are on firmer ground with Vista and VS2008. I would expect VS2008 to continue to be supported until a successor to VS2012 appears.
I don't have direct knowledge of the decisions to which you refer; I'm simply extrapolating from observing past practice.
recent releases and vista support
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recent releases and vista support
I have a couple of questions regarding the recent July and October releases. The July release states "Support for the following versions of Windows has been dropped: ... Windows Vista* ... Support for Windows XP* has been deprecated" The October release states that "Microsoft Windows XP* SP3," is supported" and then goes on to say "Support for Microsoft Windows XP* is deprecated – a future major release of Intel® Visual Fortran Composer XE will not support Windows XP" As I have 3 Vista development systems the implication from the release notes is that I need to upgrade Windows to 7 or 8. I tried the October release install on 2 of these systems and the installs appear to work. I can compile and run examples from within Visual Studio and from the command prompt. Was does not supported mean in this case? Any timescales on actually dropping XP support? I want to budget and plan upgrades to these systems.