[Bug 372487] [NEW] kmail downgrade wipes dimap cache

[Stephan]

Public bug reported:

I recently upgraded from intrepid to jaunty just to find that I'm affected by bug 338669.
Thus I re-installed intrepid on a separate partition yet sharing /home between both installs.
The next time I launched kmail it siltently wiped all the gigabytes of dimap cache.

Version in jaunty: kmail 4:4.2.2-0ubunut1
Version in intrepid: kmail 4:4.1.4-0ubuntu1~intrepid2.1

Perhaps using kmail 4.2.2 had siltently converted the file format, at least
kmail 4.1.4 did not accept the dimap files as its own and initialized from scratch.
More precisely:
folder .kde/share/apps/kmail/dimap is gone completely.
.kde/share/config/kmailrc has shrunk from 350kB to 35kB,  looking at the settings
dialog my account's receiving side is empty.

Perhaps using an older kmail on files last modified by a more recent kmail is
a bad idea to begin with (yet a distribution bug may force you to downgrade the OS,
so you may have no choice?),  BUT erasing gigabytes of mails should never go without 
a warning and an option to cancel, IMO.

** Affects: kdepim (Ubuntu)
     Importance: Undecided
         Status: New

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