[Bug 372487] Re: kmail downgrade wipes dimap cache

[Stephan]

Your decission is fair, of coures, just two remarks still:

I wasn't asking for sophisticated data migration and stuff, just the normal check
that an expected format version doesn't kill user data. Shouldn't cost much to implement.

Second, I strongly believe that even basic support for downgrading WOULD immensly
increase the value of any open source software. Recall that I wasn't performing the
downgrade just for fun, I was forced to do so by bug 338669 (which wasn't even considered
critical, so we must face: this is just a normal bug as there are millions of out there like it).
Currently, upgrading to a new version of XYZ (e.g., Ubuntu) is a game: you can win but
you can also lose. If losing means: game over, there is no joy in using the software.
If you still have a chance to move to a safe place after upgrade has screwed up your
system, earth (well your computer ;-) would be a much safer place.

Compare the current situation with software in the previous century which didn't have
an undo button. Something we just wouldn't accept nowadays. Mistakes happen at all 
levels. We'd better have means to recover from them. I don't think I'm exagerating here.

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kmail downgrade wipes dimap cache
https://bugs.launchpad.net/bugs/372487
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