zdb and past files for archive

[zoro]

First :what is the file size limit for zdb files ?
Second : I would like to archive mails in outlook from the zdb file .
So I would like to make a rule ; all mails older than 2 months go into pst file "archive", and then remove the mails from the inbox.
Is this setup possible ? (I would like to do this to free some space on the server)
I guess in this setup the mails are deleted from the server and saved into the local pst file ?