@morrow without logs this will be hard to track down. can you ask your administrator to open up a support case for this?
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.