Could this be caused by mailboxes that haven't been reindexed for a long time? It may look like the old mails that is 'missing' isn't seen by the user on the old server either. So maybe it's just not indexed right and the physical mails isn't at the old server either(just shows wrong in cli?) ?
When i compare mails on old and new server I only use CLI. (zmmailbox -z -m user gaf) |