Most of the upgrades I've seen since I first got calibre weren't of any interest to me (this is not to denigrate them). 0.7.0 (or was it 0.7.1?), however, was a huge improvement, especially the customizeable columns. I keep my previous installation files (so I can go back if I want or need to) and check out each new upgrade I install as throughly as possible before committing too much to the new upgrade. If the new upgrade buggers up my library so it won't work with an earlier version, I can always download the versioned copy I have on line with Carbonite.
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