Originally Posted by phenomshel
Same thing happened here, Kovid. I didn't mind the change, though, so I didn't think too much of it until I saw the original post, above.
The font within calibre on my Windows 7 machine has definitely changed.
That would be because of the upgrade to Qt. The windows 7 support in Qt 4.7 had a lot of work, perhaps that included a different algorithm for settling ona default font.