How to retrieve unread status from backup ?

Hi,

I have done an unfortunate "mark all as read" on my mailbox, and I'm
not one of those "mailbox zero" guys. So I have lost some valuable
information. But I have some (old) backups.

So my question is: how do I retrieve the "read/unread" status from the
(not so recent) backup, and how can I reapply it to my running server
(which continues to receive mails regularly) ?

Regards,

	Xav
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