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Approx 6% of visitors to the calibre-ebook.com use XP and 4% use versions of OS X older than 10.7 (which is the minimum that calibre 2.0 requires).
Let me re-iterate. calibre 1.48 works just fine on all these older systems and is a perfectly mature and functional piece of software. Use it as long as you feel the need to not upgrade. After all if you are not upgrading your OS you should not mind not upgrading your applications either.
Personally, I would be delighted to continue supporting older systems, and indeed, nothing in calibre's own code prevents it from working on these systems. But the decision is not in my hands, support for them was dropped because of Qt 5.
As for those of you complaining about the fact that calibre 2 runs OK on your XP systems. That is great for you, but I cannot, in good conscience, release software that I know to crash randomly on large numbers of XP systems. Such crashes can in the worst case lead to loss of your data. And if the release exists, it will be used regardless of how many warnings I put up.
If you are willing to accept that risk, and run on XP anyway, you can run from source, that is the extent of the support I am willing to provide for running on XP. Otherwise, just be happy with the nice, free, fully functional calibre 1.48 that will always remain available to you.
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