One domain has about a dozen email addresses, all using IMAP.

Current total email space used is nearing 1.5gigs.

We'd like to archive messages, in their existing folder structure, based on date. For instance, if account@domain.com has 30 folders with messages, we want to recreate the folder structure and have emails that are older than date X moved into that structure.

Once that's done, the structure on the IMAP server has emails newer than X while the other structure has email older than X. Location of the archive isn't important, so it can reside on their office server, a DVD, etc.

Any simple thoughts?