Reading tip for this weekend: "How to select the right hardware components for your groupware infrastructure" (PDF) http://t.co/2umNvaEet3
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With Zarafa Archiver the archiving is done in steps, where each is optional and configurable in age, and can be skipped or joined with an adjacent step. The steps are 0: no archive, 1: archive-copy, 2: archive-stub, 3: archive-move, 4: archive-purge. The order of these cannot be altered.