Outlook 2013 - Archives only large email attachments. My Outlook 2013 running with auto archiving, all mail older than 6 months are moved to a separate arkiv.pst file. But when my mailbox right now is very large, and with many large attachments, I would like to be able to make a one-time action, which gets all mails larger than 1MB moved to the archive file, although they are not yet 6 months old. It is important for me to save these large mail due. Content.