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<question><para>Can I use two different versions of &kmail; at the same time? Can I go
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back from a current version of &kmail; to an older one?</para></question>
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to stick to a certain version and not switch back and forth between different versions.
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Downgrading to an older version will probably cause problems, ⪚ because the index file
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formats might have changed. Upgrading should never be a problem.</para></answer>